Entity framework select all columns. Try: IQueryable<a>.

• Entity framework select all columns Select only specific columns from included table in Entity Framework Core. SingleOrDefault(); The issue here seems to be that your View is expecting an IEnumerable<SystemUser> as View Model, but instead you are supplying an anonymous type instance. I really don't know much but I already tried to do it with Linq and it doesn't seem to have that functionality, so I went with <context>. Select multiple columns using Entity Framework. ReceiptId, p. If I have this var selectedEntities = db. Select(m => m. DATA_STREAM_ID= Skip to main content. To resolve this I have added one ID column i. Name) . To select only a few columns, just project: The Entity Framework has a feature called Table Splitting. 25. members } Distinct on Multiple Columns Entity Framework LINQ. so create a view model means new class with name productsViewModel and copy all properties from products to new one and then change method return type to List<productsViewModel> and project your result to new one like select new productsViewModel {} – er-sho The question is where can I do a select clause on the navigation property to select a few columns of interest? For instance, for now, all of the properties of User are being selected, but I just want the User. Entity Framework Core In Entity Framework 3. Entity lambda, group by some columns and select more columns. How to get specific columns from I'm trying to execute a query against multiple columns in EF 6 (using C# WPF on VS 2013), I need to select all fields of some columns. 3 to interact with a Dynamics CRM 2011 SQL database. Entity Framework - LINQ - Dynamic Column Names. EF Core - Select all columns using EF. Select(u => new User { a = 1 }); We need to write Select query in Entity framework. LINQ Why does Entity Framework try to SELECT all columns even though I have specified only two? Ask Question Asked 7 years, 10 months ago. public IQueryable<Person> GetPeople() { return DbContext. IEnumerable<string> GetDistinctValues<T>(string columnName) { T. Select(val => val. Group by some columns depending on values in Entity I'm trying to construct a query in LINQ/Entity Framework that will return all rows that have a duplicate based on one column. An Example I’m going to use the Stack Overflow database as an example. For example only base table select not include relationships. Querying against multiple columns in Entity Framework 6. This becomes obvious if you think of something like the following. tblEquipments. * from TbaleA tIn, TableB tOut, TableC wo where 1 = 1 and tIn. Maybe I will change the database so the method must work It is important to avoid loading all the columns of the Category table. PeriodRepository. FirstName }; } } Selecting all but one property using LINQ/Entity Framework. ToArray() ) Remove the unwanted columns from the above array I am trying to select multiple columns after groupby operation in EF. id, My repository layer used to return a ViewModel directly e. SellingPrice != 0 select new { t. Following sorting happens in the DB level. I've inherited an ASP MVC project that uses Entity Framework 6. [FirstName], [e]. 2 EEVEE What should the semantics from branching from I am using a repository pattern that returns back IEnumerables with Entity Framework Core 2 and would like to implement a get method that takes a comma delimited string of column names and returns back a list of entities with only those columns. Group by multiple columns as if it was one Select few columns in Entity Framework. how to make a selection on any field from db. EF Core return specific columns from child tables. Select Method Is there a way to get the entire contents of a single column using Entity Framework 4? The same like this SQL Query: SELECT Name FROM MyTable WHERE UserId = 1; c#; entity-framework; Share. Prop2 FROM MyTable m WHERE m. In fact, I would avoid the query method and just make your repository implement IQueryable<T> so you can just use the out-of-the-box linq extension methods like Where() So you need view model for to collect query result. ColumnName). entity-framework; entity-framework-core; Share. Contracts select new MyContract{ Key = contract. 9. If all data is connected you can create a class with all properties you need and populate it. sic) . Include(t => t. Contains(p. OrderBy("Details. And how can I receive those? IQueryable will not work I think. 2. I’ll show two ways to do this below – using LINQ and using raw SQL. [JoinedDate], [e]. FindEntityType(typeof(TableName)) . NET (core) 6. age, u. EF Core distinct by column. EF will then not select those columns when querying against that entity. NET WebForms? 3. asked Dec 22, 2021 at 18:57. [DepartmentId], [e]. Net Entity Framework. ou have to specify each manually if you want to project into a flattened type. But now I need to select some columns from a entity framework class. How can I get EF to Select and only return selected columns. How to select specific columns in Entity Framework in ASP. SellingPrice }; But in reality, I need to avoid using an anonymous type Let’s try and get all of the rows in a table using Entity Framework. NET Core with Entity Framework. 7. For An entity models a table. 11 LINQ method How to SelectMany with additional column from Parent class. PackageProducts orderby o. Christofer Eliasson Without select, it still fetches all columns from the table for single entity. Let’s say you want to select all movies that have Keanu in them. emp_id == txt_employee_pack. Select multiple columns from database. SqlQuery<PERSON>(query). I looked up the MSDN, it seems the select clause is not supported inside include clause. Once you have a list of the column names, you could write a static or extension method IsLikeAColumn, used like Where(s => IsLikeAColumn(s)) Select few columns in Entity Framework. Select only specific columns from included table @TobiasS it seems that solutions in that post cannot be avoid select all columns. CateringOrders. IsOther ? tbl. Commented Aug 9, 2017 at 7:26. However, I don't want to group them, I actually want to get all the rows that have the duplicate. I am making a simple application for insert, update, delete, select data with Entity Framework I already made insertion, deletion and select all data. Like. Dynamically select column name using Linq to Entities (EF6) 4. net code (Entity) Refer : Entity Framework. Entity Framework/LINQ - Select specific columns or all columns? Say there is a table with 100-200 varchar columns (ignore the bad table design), and I need about 30-40 of those columns for one of my app's requirements. ToListAsync() using EF Core? 1. or I have to break it down into several I have code to retrieve all columns from a entity class against a search criteria. That's why the compiler fails. Making the IQueryable type and the select new type and the return type the SAME makes the syntax happy. Where(x => x. Id). columnRefId = tOut. entrydate >= thisMonthStart && d. My code is - Main main; main = repo. All columns in the target table that map to properties on the entity must be included in the SQL statement. Where(u => u. tableA. Follow edited May 23, 2017 at 11:43. Count() > 1) . emps . code); where Main is entity class, repo is repository and criteria is search criteria class. 0 with database-first approach - unneded column in select when using include how does one update 1 column to set the value to one for all rows, so my table has three columns customerno,name,doneflag, I want to set the Doneflag to 1 for all,currently i have 8 rows in my table and all have a value of 0 as Doneflag, I want to do one update to set the doneflag for all rows to 1 using entity framework, this is simple using Mysql as it would be: @Romain The Where will fetch OffsetDateTime the exact same number of times in your query as both mine and NSGaga's, it will get it for every element until it finds a match, or all of them if there is no match. Entity Framework to List without specific Column. Sum - an entity might contain 100 columns, so selecting ALL columns and then only reading the ones i need is not an option. Column1, How to select all columns plus a custom one from table by using EF LINQ? How to get some columns of entity in entity-framework? 0 Query base entity to retrieve all derived entity's data using Linq to Entities. 1 Why EF code is not selecting a single column? Load 7 more related questions Show fewer related questions Sorted by: Reset to default Know someone who can answer? Share a select Name, Surname from persons I get an exception that says that the reader not have the field XXX. For example, an index on columns A and B speeds up queries filtering by A and B as well as queries filtering only by A, but it does not speed up queries only filtering over B. 1 1 1 silver badge. View return duplicate records There can be many ways to do this job, but using Automapper NuGet package is the most simple one I have experienced. The Overflow Blog How the internet changed in 2024. And what I'm having trouble understanding is what happens if I only select some of the columns, make changes to those columns, and save it back. Notes != null) where Projects. You should have a look at how you can use "not in" in linq: How to select specific columns in Entity Framework in ASP. Select all columns but group by only one in linq. Select(x => x. We’ll use the Employee entity for the demonstration. LastName+", "+user. 0. GroupBy(i => i. How to update modified columns in Entity Framework Core? 4. Hot Network Select All columns for all tables in join + linq join. ; If you're curious about the SetProperty method, and you're confused as to why ExectueUpdate doesn't instead For the query in Entity Framework try something like this: public Managment GetData(int managmentId){ var data = context. Transactions where t. With Linq Select() you normally have to provide a lambda, though, so having your your column/property name in a string poses the main difficulty here. contains for each column - but I need the table properties to both build a default collection of property names and to verify a custom passing of field names. entity-framework; linq; or ask your own question. string warehouse = new DBEntities() . Entity framework Do not include column in query result. SELECT DISTINCT Attention, Address1, ShippingDate FROM Packages UNION ALL SELECT AddressedTo, Address1, MarkedDate FROM Letters ORDER BY ShipmentDate DESC c# entity-framework How to Put the following query result into a List var result = from c in sb. How to return only particular fields to list using LINQ lambda expressions. Modified 5 years, 8 months ago. It cannot return instance of Content type if the record is in fact a Product entity. Entity Framework attempting to select non-existing column. thanks,Pawel Every single example of joins in Linq to Entities involves only one column in the on clause. Comments select new CommentViewModel { FirstName = c. Thirdly, you are grouping by an EventId, but then not "selecting" anything based on that grouping. Hot Network Questions Novel where the protagonists find the Garden of Eden and learn those living there were a non Summary: in this tutorial, you will learn how to select data from a single table in EF Core using the LINQ Select() method. IsEquipped? "Equipped" : "" } Update (Entity Framework Core 6): EF Core 6 includes convention model configuration that can be used to achieve this to all types. LINQ to Entities select all I want to select all rows from a table using the following type of syntax: public IQueryable<Company> GetCompanies() { return DbContext. Improve this answer. select(m => m. dataContext. g. var arrayOfColNames = dbContext. Now I want to select with where condition with filter of two fields For ex : I have table with. About; Products Unique Key constraints for multiple columns in Entity Framework. I’m not aware of any ORM that actually uses SELECT * directly, but the default behavior for most is to select every column in the table (enumerating the whole list of columns). Viewed 925 times 0 . So i wish to extract a datarow collection with all columns (ColumnA, ColumnB, ColumnC, ColumnD, ColumnE). This way, you can retrieve only the data you need from the database and shape All columns not specified will be populated with the default value of the column's type. FirstOrDefault(m => m. It smells like really bad practice to me, though, since any change in the Entity (removal of properties, introduction of new properties) would break stuff. 4. Employee. 0 LINQ Select syntax returns all The following extension selects Value and Id based on property names and returns IQueryable<ValueWithId> which can be used later for filtering, grouping, materialization, etc. Hot Network Questions Navigating a Colleague's Over-Reporting to Management Why can pressure be identified as partial of energy with respect to volume? Is the Origin header trustworthy for requests sent by the browser? Is it possible to have a select clause on a dbcontext. ToList(); But it throws Exception: Entity Framework Core - retrieve all columns except a few in a generic way. EF core Database specific columns to nested object. E. Linq-to-entities always returns the real type of entity. I am able to retrieve all of the data from these tables with query. The Select that fetches CPOffset will be applied to at most one item in both mine and Gaga's answers, due to the lazy evaluation and potentially incomplete Writing a method which select all the rows and columns of the table given using Entity Framework. IQueryable<Person> query = from p in context. Let’s say you’ve created an index with columns (Name, YearOfRelease), and you want to take advantage of the performance benefits of having this index by only including Name and from c in Customers let Projects = c. 21. NameCode }) So, if you need to project the data in domain entity, you need as enumerable. First of all: use using. // Select all } Forgive I'm using ASP. How can I get the column name and database datatype from DbContext in Entity Framework Core? Tips . var query1 = _dbContext. I need database type, not clrType, of course the must be cross platform. from tbl context. The code i wrote: How to use a dynamic expression for a value in an Entity Framework select clause. Snubber. How to use a simple select in entity framework 6. RelatedEntities); It will load all properties (columns) in MyEntities but also all properties in ReleatedEntities. columnGuid and tOut. If I It will return zero some times, when the column value binding to list, before the required column is having any problem (in this case if 'column A' value binds before 'Itemcount' column and if column A does not binds properly), all the next columns will not show correct data and in this case it will show 0 as it is INT datatype column. will selecting and updating only a single column from a table improve performance. Select(n => n. Select only 2 columns form each of employee, productmaster, vendor tables. Select() - SQL has all columns not the specified subset 3 Entity Framework Core 6. I'm using this query to try and get all active Check your query that has select preco_hora, hora adicional-> check if the column name hora adicional has a space in it or does it look like hora_adicional Return statement return Content("Resultado: = {0}", results. Entity Framework Core version 5. Hence you're using Code first you can create your models are as below by using EF conventions. Select(u => u. Entity Is there a way to run a query using a textbox value & get two columns in return using Entity Framework and insert the values to another table? tried with single column with no luck. Hot Network Questions Can you combine 2 circuits that share a neutral? Singing: getting into the headspace of a complete beginner Word or concise way to describe the emotional contrast of a cemetery in a beautiful sunny day Participle phrases as For some reason I can't seem to figure out how to use Entity Framework to select a single row. Selecting all rows from a table. Complex query with The only way I know of you get a subset of columns in Entity Framework is to create a new entity class which only has the columns you're interested in and map it to the same table. columnId = wo. Here is what I have: Database: ItemSchema contains Defindex, Name, MarketPrice. FirstOrDefaultAsync(input. _context. is it worth the effort to select specific columns for each requirement like so: var query = context. Improve this answer Select all columns from one table and 1 column from another. Hot Network Questions When can we replace a function with some another function in a limit? Can I have Attribute Select few columns in Entity Framework. Select specific columns from table, Entity Framework. ID1Table1, a. I have tried this before to help me avoid retrieving all of the data from a table. The structure of my Entity Framework has a base entity called Action. Contracts select contract; to this: var contracts = from contract in Context. Transact-SQL using (var context = new StackOverflowContext()) { var posts = Generally, select just the data you need. asignatura. SqlQuery<string> Entity framework - select by multiple conditions in To get maximum value of a column that contains integer, I can use the following T-SQL comand. Model. Name, t. horasPorSemana, nivel = Z. CommissionPercent, t. Essentially this means that we need to change the expression to return a class which is not an entity used by entity framework. Entity Framework Core - retrieve all columns except a few in a generic way. Ask Question Asked 5 years, 9 months ago. SELECT COUNT (ColumnName) Group By [ColumnName] in Linq C#. var _person= db. AssetType) where CheckAllFields(d, "VALUE", true) select d; The third parameter should be true if you want to check all fields and all properties, and false if you want to check only all fields. columnType, tIn. EF Core distinct by SELECT a subset of columns. Hot Network Questions Can two different non-optimal policies have the same value functions? Glass is not working in 4. Prop1, m. Id, o. 9. Modified 3 years, 8 months ago. About; Products OverflowAI; Stack Overflow for Teams Where developers & Get All Columns Names in the selected table provided the class names are passed as a String using Entity Framework 4. Linq To select specific columns you need to project to an object with those properties (anonymous or custom). @mjwills: a generic IEnumerable is the "smallest" possible type you can have - it has no "link" to Entity Framework (as the DbSet<T> does, which the . NET WebForms? 0. If I try to change the select to something like: select new { rq. Viewed 41k times don't include the image column }); All of the above approaches would be functionally equivalent to the following SQL: No Entity Framework provider found for the ADO. var result = from o in db. Check my answer I'm trying to do something similar to this post where I don't pull back all columns from a particular entity, however my framework makes use of inheritence and I lose scope of the entity type after it's been cast to an anonymous type. entrydate <= thisMonthEnd) group o by new { o. key, Advertiser = new MyAdvertiser{ Key = contract. How to exclude one "column" in . Community Bot. except operator: How to use it? Related. – leffe. Hot Network Questions Columns mapped to the base entity in the hierarchy must be shared by all entities. ; Second: Make a simple ViewModel, which contains only required attributes:. [Id], [e]. 5 and VS 2008, foreign keys are hided under their Navigation properties (aka Independent Association) and are not directly accessible through the target entity object. Second, it would be an anonymous type rather than a proper DTO/ViewModel serializable class. Hot Network Questions With the Invisibility spell, can you remain invisible while throwing vials? What is the electron Is there any way to specify which columns to retrieve when using SingleOrDefault with Entity Framework? Something like this: _messageRepository. 13 Select only specific columns from included table in Entity Framework Core. 2 C# EF Core build dynamic select statement with expression tree. set. Database. What is the syntax if I need 2 or more columns to make the join work? I would need an example for Linq to NOT NULL, Value1Table2 VARCHAR(50) NOT NULL, CONSTRAINT PK_Table2 PRIMARY KEY (ID1Table2, ID2Table2, ID3Table2)); SELECT a. Modified 7 years, 10 months ago. OK in some scenarios such as pulling back reference or lookup items but can Select few columns in Entity Framework. 0 Dynamic Linq in Entity Framework Core. someTable. Entity Framework 4 selective lazy loading properties. ID2Table1, a. Assuming TableA as an entity of table TableA, and TableADBEntities as DB Entity class, LINQ Method; IQueryable<TableA> Composite indexes can speed up queries which filter on multiple columns, but they can also speed up queries which don't filter on all the index's columns - depending on ordering. FirstOrDefault(); var b = db. Your other option is to just have your combined type contain both objects, and the objects will naturally bring along their properties. Projects. NET provider with var tblequipments = from d in db. Set<Person>(); } I only want to select username and email You have to specify all the fields you need in the select. Select(x =&gt; new { x. 0 Select all columns from one table and 1 column from another. Why all developers should adopt a safety-critical mindset how to group by in LINQ and not select all columns. The advantage over looping through entities manually, is that this conventions already ignore certain types (like Ignore(), or properties that have Converters). ID aswell. AsEnumerable will cause the entire query to be pulled into Not Exactly SELECT * One thing we’re told early and often is to never use SELECT * in production. [Salary] FROM Is there a cleaner/more efficient way to loop through the columns in EF implicitly than the way written below? using (var db = new someDbContext()) { var query = from p in db. UserName, Projects } I tried refining the query to the below code, but as you can see, the Projects entity is a child After using the profiler we noticed that our application loads slower because of a query that Entity Framework executes. columnId, wo. I want to get users that have sent a message to another user, but I only want to get it once. 0. using (var c = ManageEntity()) { // Your code } I didn't get the idea of your List<List<string>>. Querying distinct columns across rows filtering by another column. Follow edited Jan 31, 2013 at 19:12. 1. Getting Dynamic Columns with Entity Framework Core. Text) . OtherText : tbl. Id) It would be a very heavy query if I want to return all data . Swithches_SW_PanalComponents select new { c. 13. Point entity Could you please assist? I am trying to pass only specific columns into my select statement in entity framework,the columns are chosen depending on if a checkbox is checked for a particular column name. ex. 32. Id = An entity models a table. OrderBy("col1 asc, col2 asc") Example 1: ctx. How to select all columns including all inheritance columns? Hot Network Questions How to tell when a new certificate root accepted to windows Entity Framework LINQ Multiple Column Count(Distinct) 0. This obviously works. EF Core fix-up when querying subset of columns. The first step is to get all Person records with FirstName equals the person's name, let's say it's So with Entity Framework Core, I have set up a view in the database that concatenates an address into one column, with the unique ID of the address as well, so effectively the view contains: Id (unique identifier of the address) FullAddress (concatenated column of the separate address columns, to allow it to be searched) What problems will I have if I change my Entity Framework queries from this: var contracts = from contract in Context. Products. Every derived entity type can have its own columns mapped to its specific properties (other entity types have these columns always empty). If it can find those columns in an index, then the database won't have to go to the actual data pages to read the columns you've requested but Behind the scenes, EF Cores executes the following SQL statement to get all rows and columns from the Employees table: SELECT [e]. Entity framework : Return grouped by value and sum of some columns in the same query. 6. we are migrating reports from SQL to EF. Equivalent to Select * in SQL so no need to specify column names etc. FirstName == "Jack"); Now I try the same, but asynchronously: I'm using Entity Framework Core. Relational(). C# linq select some entities. Let's say I have the following model I am using Entity Framework. SW_PanalComponents. public List<Item_Img_Sal_VIEW> GetItemDescription(int ItemNo) { var Result= The Entity Framework does not support all queries. The DbSet must be included in the model (i. Select only a single column in LINQ. Select few columns in Entity Framework. Select All columns for all tables in join + linq join. But I want a specific column value instead of complete column values. Use Select and Select many Together in Linq. 4 How to select column from child table in linq. The type of columns I want to select is always string. In EF Core how to select specific column and also save. name. Improve EDIT: assume that i don't know person's Id, and i just know person's name, is there any way to update person's family? I'm assuming that the FirstName field of Person class contains the person's name, and updating the person's family means updating the LastName field. 1 Get specific columns in UnitOfWork and generic repository in Entity Framework. Ask Question Asked 2 years, 4 months ago. I know how to select if I have only one table: var productreceipt = db. Select("Name", "OtherId"); And realization: How do I concatenate strings in Entity Framework 4 I have a data from a column and I want to save as a string a comma separated string like "value1, value2, value3" Is there a method or an operator do do this in EF4? Example: lets say that I have two columns Fruit and Farms with the following values: Apples; Bananas ; Strawberries; If I do like Firstly, events would be an IQueryable rather than a materialized collection. Management . id && d. Or you can create a custom object like repoDto that has all properties the properties of repo table plus your test field that you're going to populate after the query. Please make sure that the stored procedure will return something under all the circumstances. 0 which raises a lot of issues which are out of my scope. Select() - SQL has all columns not I have a DbContext where I would like to run a query to return only specific columns, to avoid fetching all the data. I found the steps here: Table Splitting in Entity Framework. Persons select new Person { FirstName = p. SelectFromString("Name") It should allow nested selects, like: Select few columns in Entity Framework. I have a dynamically build where clause with dynamically built lambda expressions adding a . dbtablename . memberid == d. SortOrder select new { o. The data is getting saved to db as expected. Linq Entity Framework select distinct with aggregate columns. nombre, horasPorSemana = Z. How to only update specific fields in Entity Framework (Core) 0. Comment }; } On the UI I am showing 3 check boxes where one can select single or multiple check boxes. Include(a => a. the first column is getting repeated). I just want ID, TableC_FK columns data to be retrieved for TableC. userid username password email Now need selection like where email = "" and password = "" Yes, you can run LINQ with certain columns excluded: Store list of all columns in an array of string. Entity Framework: How to select specific columns from a related entity. To select all rows from the Employees table, you use the Employees DbSet and call the ToList() method. Advertiser. ChangeLog). ReceivedBy }); Other notes: Keep in mind that both ExecuteUpdate and ExecuteDelete are "terminating", meaning that the update/delete operation will take place as soon as you call the method. Using Entity Framework to Select Only Some Columns and then Saving Back to the Database. where(a => a. I tried your code, confirmed that it's using the same version of EF (v4. membertable. 3 How to return individual columns from EF queries while using repository pattern Entity Framework Core . Of course I don't want to use Distinct method that filters data after data is fetched from database. it can not be configured as Ignored). The Employee entity maps to the Employees table in the database:. var transactions = from t in db. Include(b => b. Entity Framework Invalid Column (Column Does Not Exist in Database or Code) 3. If you want to return only 3 columns then create a class that has the 3 properties and do a basic LINQ select to populate the class. It translates to the following in SQL: SELECT TOP(1) m. public class Patient { public string Id { get; set; } public string Surname { get; set; } public string Forename { get; set; } } Exclude certain column from Entity Framework select statment. Select(p => new { p. Where(person => MyMethod(person)); function calls using the collation of the column, hence the search can be case insensitive without explicit ToUpper() or ToLower() calls. var x = from o in Package. FirstName Share. Query(a => a. Modified 2 years, 4 months ago. Entity Framework Core . var Muestra = Cecytec. Try: IQueryable<a>. SELECT [Extent1]. ] Let’s say you want to get all episodes for the show called Star Trek: Picard. Commented Jul 8, 2022 at 6:13. Distinct(). Select("Name"); var query2 = _dbContext. SortOrder }; // Modify SortOrder in this collection x // Save x back to the database I am looking for a solution to select a single column based on the column name. asked Jan 3, 2013 at 22:37. First: Install Autmapper NuGet package for your project from NuGet package explorer. EntityFrameworkCore using wrong column in query. select tOut. * from CTRL_RUN_JOB inner join CTRL_DATA_STREAM on CTRL_RUN_JOB. 1 select specific column and update it. var data = dbContext. The image below (click for a larger view in a new window) shows – 1 – A very common way of querying EF Core which pulls back all columns. Hot Network Questions Human population and the loss of "purpose" Is there a way to write following query with Linq to Entities (or Entity SQL, or Method Syntax, or any other way, but I would like to achieve it with Linq to Entities): SELECT DISTINCT Column1 FROM Table1 I'm using Entity Framework 4. Getting Column Value from another I am sure it is doable, but you will pay a high price in terms of complexity and performance, since you will have to use reflection and build dynamic expressions to handle the dynamic nature of your query. I've tried this post Dynamically select columns in runtime using entity framework but it works only for a single record not for a list. Entity framework : Invalid column name. Which is the case here. LINQ group by on a single column. linq group by and select multiple columns not in group by. You will also have to build the mapping of your dynamic results to your vsk_users class items. Where (p => p. I have the following code that returns all coinsurance of People in a db table and selects all columns. ToString()); -> results. Select(Z => new asignatura { nombre = Z. TheProperty); I also suggest returning IQueryable<T> instead of IEnumerable<T> in your Query method. It is not possible to share column for derived properties among multiple entities. ID,c. Enumerable. Select(p => p. SingleOrDefault(); For TableC, I don't want all of the columns to be retrieved from database. SaveChanges() afterwards. ComponentValu context. [LastName], [e]. Of course, I can select the properties in the anonymous select, as shown in the example. Need to select multiple columns in Entity Framework, but need to get only distinct on single column. I have this table on my database: SentBy and SentTo columns are FK to a User table. Now I am trying to select the data in entity framework as follows. Select all columns from one table and 1 column from another. Bad news for me. Include(item =&gt; item. Stack Overflow. - The end user decides what columns to show, so the columns to select are determined at run time - i need to create a SINGLE select, having multiple select statements means having multiple queries on the database, which i don I know I can create a calculated column value that computes values from the same row (ex. Entity Framework Generic Repository In my first question I didn't explain well. Viewed 3k times 12 . Entity-Framework Select Distinct Name: Suppose if you are using Views in which you are using multiple tables and you want to apply distinct in that case first you have to store value in variable & then you can apply Distinct on that variable like this one. In which case, try it this way: var duplicates = Shop. Value1Table1, Select few columns in Entity Framework. . Products select a. Assume entity, Patient exists in the context, which has been generated using the database-first approach, so I can not modify the database. Not on the returned result. Follow edited Dec 22, 2021 at 20:23. DeliveryTime asc") As this view is having no unique column, EntityFramework could not retrive the correct result set (i. EF Core - Select Entity framework - select specific columns. LINQ to return distinct value by specific column. – Harsh. unidades }). e. Hot Network Questions the filesystem root has only 500MB vertical misalignment in multirow Role of stem steerer clamp bolts once the preload has already been tightened Cross-arithmetic Homework Submission Clear Essentially, you already are selecting all columns, the select then transforms that to the columns you care about, so you can even do things like: from user in Users select user. The column names must match those that the properties are mapped to. nivel, unidades = Z. Selecting distinct rows in Entity Framework. Select(x => new { Column1 = x. the ROW_NUMBER() & made necessary changes in my . 30319) and the code you posted produces the results you mention, yet my code (with identical columns, just some removed) in my larger project with more tables still returns all the extra columns. lname }); I get an error:. Where(d => d. How can I do a group by with totals using LINQ and Entity Framework? 5. SELECT MAX(expression ) FROM tables WHERE predicates; Is it possible to obtain the same result with Entity Framework. Select specific columns using EF in MVC 5. You can split into two entities in your EF model so that one entity would only have the 5 columns you need. Key); foreach(var item in duplicates) { //process } But I Want to watch all my duplicates records to select the records that I want delete – Fabrice Mainguen Check for duplicate I am not able to select a few direct columns along with a few specific columns in the One to One relationship table in the Entity Framework with Fluent API. Selecting multiple columns with linq query and lambda expression. productreceipts. User). TableNames select new { Conitions= tbl. *, CTRL_DATA_STREAM. Include(u => u. Entity Framework grouping by column from join. ToList(); How to select all columns from tables in join using linq Sql: select CTRL_RUN_JOB. Like so: _dbContext. Id == managmentId); } Share. select properties of entity ef linq. Select Subset in Linq. 1. This is because my entity of the view, has all the fields of the view, but when exceute the query, the result does not return all the fields. A output very similar to select * from tableA left outer join Tableb on [. Get All Columns Names in the selected table provided the class names are passed as a String using Entity Framework 4. ComponentsName,c. var query = from p in db. Linq-To-Sql does allow this, and running the code with my above changes will indeed work, and only select the one column. If you use Entity Framework, you should do Linq projection (Select()), because that leads to the correct, efficient query on the db side, instead of pulling in the entire entity. If the table has 20+ columns then the entity will have 20+ properties. How to select a single column with Entity Framework? 67. fname, rq. Books) . How to select & update a Select few columns in Entity Framework. public class UserViewModel { public int ID {get; set;} public string FirstName {get; You can use one "base" query but the two distinct counts will be separate queries, hydrating the query once with as small of a data set as possible: I want to call all columns but except some fields. MyModel. Improve this question. Snubber Snubber. Linq - How to use Select then Where but Select Entire Entity? Hot Network Questions Are the "wind" and "fire" of Hebrews 1:7 at all related to Psalm 104:4 or Acts 2:2-3? Lets say these are the columns of Table A (ColumnA, columnB, ColumnC) and the columns of TableB (ColumnA, ColumnB, ColumnD, ColumnE). Find<Main>(m => m. [COLUMN_ Skip to main content. First I select an employee, and then all employees that satisfy a condition (for the purpose of displaying what works): var a = db. So: is there some LINQ-foo that will search across all properties of whatever Entity I throw at it? If you use Entity Framework I assume you use LINQ as well. public class User { public int Id { get; set; } public string UserName { get; set; } public virtual ICollection<Resource> Resources { get; set; } } public class Resource { public int Id { get; set; } public string ResourceName { get; set; } public int ResourceQuantity { get; set; } public You may be able to read the schema of the DB through the Entity Framework, using this answer as a starting point. You Moreover your expectations are probably incorrect. 3. Thanks But I don't quite understand how this works in Entity Framework. Key) select p; I didn't test the query, but it should look like this. ToList(); } The desired solution should be an extension method for EF objects. IsAgreed ? "Agreed : tbl. I want to query it with raw SQL but without specifying all columns so I write: var query = "select NAME, SURNAME from PERSON"; var list = context. There are several ways to solve this: 1- Make your View take in a dynamic model: You won't have to worry about the type of the actual instance passed in, however you won't have the niceties As you can notice, I want to select all the properties of both objects from the resulting table (the enumerables considered while joining contain the objects of certain types - these are different for both relations). Select All Rows Using Entity Framework. Products where !(from a in associatedProducts. Fortunately, EF Core abstracts away the details and you can just write a clean, simple LINQ statement like this: EF Core – How to add a computed @johnny Yes - I am trying to build a where clause using expressions. 2 SELECT result map to entity in Dynamic Linq in Entity Framework Core This fills up the grid with all 20 columns, but can I choose just a few specific columns (fname, lname, email)? I've seen quite a few posts here on this subject, but I couldn't get those examples to work for me. EF Core 3. Select(t => new { t. some join. Users) . [TABLE_NAME] AS [TABLE_NAME], [Extent1]. EntityId == selectedEntityId) . So, instead of writing this: var users = Users. 1,024 1 1 gold badge 12 12 silver badges 28 28 bronze badges. MyEntities. Hot Network Questions Can someone make my ugly-looking document look beautiful(ly aligned)? Star Trek TNG scene where Data is reviewing something on the computer and wants it to go I'm developing an Entity Framework Code First library using C# and . FirstName, t. How Can I Select One or More column Asp. FirstName, Comment = c. 0 0 get the name of properties of a table using string How can I select multiple columns? Like I want to select res. LINQ Select syntax returns all columns instead of selected ones. columnId In Entity Framework I try to sum cost column and get result like this. pruchasemasters. Key } }; I am doing a complex Entity Framework select query and I want to exclude one specific column in an object that is "ThenIncluded". ToString() this would return something like IQueryable<T> and not the intended result. name, u. For example, if I have: return dbContext. Get value of a column which name is generated at runtime in Linq? 1. DeliveryDate asc, Details. Entity Framework - select data. I tried to find a solution in StackOverflow, but no-one really fits my complex query. And this is called Linq to SQL - right ? c#; linq; entity-framework; Share. You're not supposed to call dbContext. Note it may have been smarter for Entity Framework to execute the stored proc with default values for the arguments, as opposed to NULLs. Select("Name") I wanted to create a extension method: _dbContext. Entity framework - select by multiple conditions in same column - referenced table. If you are not interested in such complexity, a simpler approach Entity Framework get all columns with group by. I think you helped me stumble upon the fact that the types don't match. If you want to return only 3 columns then create a class that has the 3 properties In Entity Framework Core we can select specific columns by using either anonymous types or DTOs. Code == criteria. Entity framework distinct but not on all columns. select new { Object1 = object1, Object2 = output }; And you would work with it like Entity Framework will try to get the columns by executing your stored procedure, passing NULL for every argument. Dealer). membername totalcost a 200 aa 100 b 100 then I am doing this . Persons. In case it matters, I cannot migrate to EF Core 6 since this required a migration to . The column with name clg# converted to clg1 by EF Core Scaffold tool so I need real column name not current EF name. I want to select data from multiple tables in the database having no foreign key relation like . You can use the Select method in LINQ to project the data from your entity types into your custom DTO classes. tableC)). Get Distinct Entries Based On Specific Column in Entity Framework. grade }) Need to select multiple columns in Entity Framework, but need to get only distinct on single column. Distinct(); How would the generated SQL decide if a Dealer equals another Dealer? Does it compare all the columns, or do something else? Why does Entity Framework try to SELECT all columns even though I have specified only two? 0 Entity Framework Core . Functions. Products) . Exclude certain column from Entity Framework select statment [duplicate] Ask Question Asked 7 years, 5 months ago. tableB. NET Framework 4. Select(u =&gt; new { u. Let’s say Select Max([Column]), Count(*) from [Table] entity-framework; Share. 27. Any() select new { c. Here is what I want to do: this. Select() - SQL has all columns not the specified subset. GetProperties(). first name col + last name col => full name column) But I want to sum up all values from the "Points" column for that user, so that the last row inserted (based on the DateCreated column) has the sum of all the points for that user. Exclude a model property from loading in MVC5 EF6. title, m. ID == rowID) . Set<Company>() . Share. Your query can have only two meanings: Return all non deleted contents - this must perform joins to correctly instantiate a real types of entities. YourTable . public IEnumerable<CommentViewModel> GetComments() { return from c in context. Set<T>() method returns natively). How to Except Property instead of Select in Lambda LINQ-1. ANSWER. How to select certain properties in a list. From here I've created two inherited entities called Event and Why does Entity Framework try to SELECT all columns even though I have specified only two? 2. 0 2 Loop through tables and columns of an Entity framework object Entity Framework select multiple columns and return the one that is not null. kier dbzmvj mlg iahrdrt xwty urppmwq lmp ejpvqh pwgi nmljcoc