Linq select multiple columns distinct. Operators group p by p.

Linq select multiple columns distinct Select DISTINCT on a column when selecting multiple columns in Linq. Distinct() will return all 3 records, but what if I want the first and third record and don't want to eliminate any columns from my results set? Is there a way to specify columns to ignore when doing a distinct, or explicitly include in a distinct so that I could do something like this One of the columns is a rank, and I need to make sure that only the record with the lowest rank for each job (another column, many jobs will get selected) gets selected. TITLE ADDRESS BRANCH BRANCH1 BRANCH2 BRANCH3. In these examples, "e" is my System. Or you could use the Tuple: . ID aswell. Item("Count")). If you want . EDIT SQL should look like a Mysql select first, second, th Apr 28, 2011 · I am trying to select multiple columns from an entity object but I want 1 property to be distinct. Is it possible to do this in just one SQL You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. You need to implement IEqualityComparer<Result> interface and pass instance of this interface into your . Cost) }; Sep 1, 2012 · It is simple as, if you have only these three columns in the table. Below is what I've tried. Hot Network Questions Jan 18, 2022 · The issue is that my table has four columns. FieldValues, m => { m. Manufacturer is of reference type and hence it take all as distinct because they have different refernces. And how can I receive those? Feb 23, 2012 · I tried to add . LINQ Select Distinct with Anonymous Types. Feb 21, 2024 · You can do it in a single table scan (i. ToTable(true, "PONumber", "Customer", "Address"); Solution 2 : Another alternative would be using Linq statement to filter distinct rows and then looping them as required. without SELECTing from the table multiple times and needing to use UNION or self-joins to re-combine those multiple queries). The result sequence is unordered. How can I return all the columns of a table using multiple distinct columns in Linq. Select(f => new List<int>() { f. Field<string>("Code") == txtCode. the distance column is changeable for each row so when I'm using Distinct(), it is NOT working because of distance column. As a start, take a look at the example Oct 6, 2021 · To select distinct objects based on multiple properties, pass in an anonymous type with the properties you want. Pid SKU colorid sizeid 1 'A65102' 38 2 2 'A65102' 38 4 3 'A65102' 38 18 May 8, 2015 · 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 Oct 11, 2011 · I am trying to convert this Stored Procedure into a LINQ statement: SELECT UserID, MAX(RowID) as RowID into #tempa FROM Users WHERE Approved = 1 GROUP BY UserID SELECT (bunch of columns) FROM Users INNER JOIN #tempa ON (Users. Item2 }). Select(s => new {s. ie the table should look like Jul 26, 2019 · C# Linq How to select the distinct row count of multiple columns in a datatable. Distinct(); dc is the data context. I am very new to both LINQ and Entity Framework so any help will be useful. Linq distinct - Count. Distinct(); I think this solves your problem W3Schools offers free online tutorials, references and exercises in all the major languages of the web. They are latest results in games and for example if there are 3 goals that are scored in the game, that would mean 3 lines. firmware where f. Select(item=&gt;n Oct 1, 2013 · You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. Ask Question Asked 8 years, 2 months ago. Now I need to get the distinct values of each column in a single query for which the result needs to look like Aug 13, 2015 · LINQ, how to select distinct with two columns. AsEnumerable() . Field(Of String)("User") Distinct in the previous code i get this error: Definition of method 'Distinct' is not accessible in this context. Sep 13, 2011 · as allways i need your help :) i got a DataTable which has the following columns:. text is not duplicated. This is what I have so far: May 12, 2016 · How do I (or can I) SELECT DISTINCT on multiple columns? 494. Apr 2, 2010 · Dim customer = (From cus In db. UserID = #tempa. Director} in {movie. Distinct() For Each i In counts MsgBox(i) Next May 2, 2018 · Now I can write three different queries to get distinct values. Login). ToListAsync(); list2 = await context. Apr 28, 2014 · With LINQ DISTINCT a Data Table Multiple Columns Excluding a Single Column. Mar 8, 2011 · How to group by multiple columns using LINQ (15 answers) Selecting "custom distinct" items from a List using LINQ. Distinct(); Jan 3, 2022 · (If you just want the typeID values, it's easy - project to that with Select and then use the normal Distinct call. Distinct(); I think this solves your problem Jan 25, 2014 · How to select multiple column and distinct one column by LINQ? Select distinct column names in Linq. ID into groups select groups. NET) You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. Manufacturer) to work then you will have to specify Comparer. USER_NAME == givenInfo) select res. Feb 24, 2015 · for example, because anonymous types are "compatible" with Distinct() (see LINQ Select Distinct with Anonymous Types), because the compiler generates the Equals/GetHashCode methods. Text select r). I want to only get the distinct results to not have duplicates. The problem is, when I execute the following code, it is giving me the number of rows rather than the 6 distinct values. But the distinct lines have to be the newest (firstOrDefault?) There will be times when those two properties will be the same as other items in the list, but the other properties will be different, so I can't just use . Need to select multiple columns in Entity Framework, but need to get only distinct on single column. distinct in Linq to get result based on one field of the table (so do not require a whole duplicated records from table). LINQ to SQL Select Distinct by Multiple Columns and return entire entity. Select(f => new [] { f. Oct 28, 2016 · I need to run a LINQ query against a DataTable to get distinct values using multiple columns. var result = from data in mDataTable. I have 2240 rows and I have 6 distinct values in the "Count" column. Distinct(); similarly I can write it for others. Col2). Sep 30, 2015 · i want to obtain the distinct names of users, I'm trying to do something like this: Dim query= From row In dsData. Level1Id). Select(p => Tuple. class Product : IEqualityComparer<Product> { public int ProductID { get; internal set; } public string Category { get; internal set; } public string SubCategory { get; internal set; } public string Location { get; internal set; } public bool Equals(Product x, Product y Jul 2, 2022 · Hi everyone, I am new RPA developer. Select(e => e. Distinct(p. CompanyPriority } ). LINQ: Query two tables in one query-1. LINQ, how to select distinct with two columns. ToList(). Item1, f. I want to select distinct CustomerId and CustomerName, TotalCost. Distinct on multiple columns in datatable. typeID); This only works for LINQ to Objects though. I want only row 3 among the two. Mar 9, 2012 · Let me explain my required based on this image. Distinct(); Obviously that won't give you the height, but then there is no single height. morelinq distinct by multiple properties. CustomerName, Cost = g. Where(Function(r) r(“SF-Case”). AsEnumerable(). var items = myResults. var result = (from f in db. 1. Select(Function(row) row. Field<int>("GroupId"), p. RowID) DROP TABLE #tempa When I run this SPROC I get 292 rows. What is LINQ Distinct Method in C#? Example to Understand LINQ Distinct Method on Value Type; Example to Understand LINQ Distinct Method with String Values; LINQ Distinct Operation with Complex Data Type; Implementing IEqualityComparer Interface; Overriding Equals() and GetHashCode() Methods; Using Anonymous Type; Implementing IEquatble<T Returns distinct elements from a sequence. Nov 21, 2013 · How to select multiple column and distinct one column by LINQ? 0. The exact type isn't important. I'm wondering how to do this in LINQ. var distinctRows = (from DataRow dRow in dTable. Jul 28, 2012 · . Date into g select new { Date = g. field Jan 14, 2013 · I am trying to use . The Distinct() guarantees that there are no duplicates pair ( CategoryId , CategoryName ). Distinct( what goes here? Aug 9, 2010 · If I understand your requirements correctly, something like this should work in C#: var query = from row in dataTable group row by new { row. Distinct in LINQ-C#. CustomerId, Key cus. If so, you can do that using GroupBy:. Ask Question Asked 11 years, 10 months ago. Distinct() List<Message> messages = GetList(); //The list now contains many objects, it is ordered by the DateTime property messages = from p in messages. You can use a grouping or a lookup, it's just somewhat annoying and Mar 9, 2018 · I am trying to write an Entity Framework query to select only the distinct records in the Brand Name field, but still return the other columns in a list back to the controller to display in a partial view. ToString). Feb 2, 2024 · Use GroupBy() and Select() to Obtain a Distinct List Based on One or More Properties in C#; Use DistinctBy to Obtain a Distinct List Based on One or More Properties in C#; Today we will be looking at how we can use Distinct() in LINQ on multiple objects with the same properties containing different values. I have only been able to return individual items/columns. Linq to SQL select multiple columns. AsEnumerable() _ Select row. Nov 8, 2014 · As far as I can understand you want to distinct records by subfield. firmware_release_type_text != "" Apr 29, 2015 · I am struggling with Linq, hence it is a lame question but still . Col1). var items = listObject. ToString(), kvp => kvp. CustomerName). Where(p => p. Try Teams for free Explore Teams Nov 6, 2016 · Select Distinct from multiple tables linq to sql. Jul 14, 2023 · Strangely, this seems to work properly when my Select clause only has 1 column. 8. Col2 }). Key(k => k. Tables(0). ie the table should look like Apr 23, 2015 · but in my linq query i don't know where i can insert distinct and input parameter (:pPOD) to obtain my linq that in oracle query is: SELECT DISTINCT t020. CustomerId, row. Linq to SQl, select same column from multiple tables. Name); } May 10, 2013 · LINQ select distinct, multiple columns. 295. Select(p => new { p. Sep 16, 2014 · I did my googling and after trying out the answered about distinct select and count on SO, it didn't work for my case. Distinct(); Oct 8, 2013 · The column name in the datatable is "Count". Part. Jiachen Li Jan 7, 2020 · Hello everyone, I have an excel file with multiple columns say ‘posting date’, ‘invoice’, ‘PO’ etc. UserID AND Users. calculating the occurrence of two column values in DataTable using linq. var distinctRows = (from DataRow dRow in dt. Select(ct => new { ct. Col1, f. ToArray() Best Regards. I have a table with following 4 columns. ToListAsync(); I can also do it concurrently, but it still involves multiple SQL queries, one for each column (list). First(); Aug 20, 2010 · You are applying the Distinct method to each string, not the result of the query. Id, ct. CategoryId, m. I am struggling with crating a way to do this. since i dont want to execute another MySql query to get only the branches, i figured i can do a LINQ query on the DataTable and get distinct values. Put parentheses around the query: Dim query = _ (From email In ds. Distinct(resultEqualityComparer) call. CustomerName } into g select new { g. I would like to get back records with distinct name. Distinct(); I think this solves the problem In the search for a Distinct-function for LINQ upon finding this question and realizing it doesn't exist, my workaround is by using GroupBy(). 54. Distinct doesn't work because the rank will obviously make the row unique. Apr 18, 2018 · My requirement is to get distinct sub item with their respective Item Names , Sub Item should be distinct but Item Name can be repeated as one Item can contain multiple Subitem. I added it to my table using some calculations in view model. Thus you need to introduce explicit comparison of your Result class instances. Distinctを使うといい。 というか、Groupbyはどちらかと言えばキーカウントにつかう。 Jun 15, 2009 · For any one still looking; here's another way of implementing a custom lambda comparer. AsEnumerable. id_cliente AND t021. Hot Network Questions invocation trees in tikz May 31, 2012 · I have a data with multiple lines that are similar. Mar 9, 2011 · Doing a . I have been stuck on this wayyy to long. I want to be able to select name, id, and price, for each product where the status == 1. LINQ's Distinct() on a particular property. Distinct(); This will return your desired result. Name}) . Field(Of String)("B")) Select the value of column B. In both you'll see LINQ being used, so it often causes confusion. Name} is one movie from {movie. Operators group p by p. Creating a LINQ select from multiple tables. Identifying Unique Values in a C# List. C Mar 28, 2016 · I have a DataTable and I want to select multiple columns on the DataTable that matches the input in the textbox. 3. Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values. Field<string> ("Description"); foreach (var res in result) { txtxDescription. I know writing basic query using distinct as followed: var query = (from r in table1 orderby r. ragione_sociale, da_data, a_data, t020. Name, p. CustomerId, g. EMPLOYEEs where (res. CourseTypes . Distinct() Dec 8, 2015 · For an example. I hope this will help. Tables(0) _ Select email. DefaultView. field != null && p. May 11, 2020 · The Distinct operator has an overload that takes an IEqualityComparer<T>, so you could change Product to implement that:. products). orders select p. NET, Anonymous, Key and here: Distinct in LINQ with anonymous types (in VB. Age }) . adding a search in a MVC. felipe-gavilan. from l in logins group l by l. I have 7 rows of data. The obvious problem is that the distinct-set doesn't contain all the data (say you have three fields but only want to distinct on two fields missing out on the value for the last field, but, then again, DISTINCT in t-sql works the same way). Distinct Does not work on multiple values so I tried May 4, 2013 · [How can I do SELECT UNIQUE with LINQ? I wrote the below expression to select rows with unique OrganizationID column from the dt datatabe which contains multiple columns. I have a table of products. Entities. RowID = #tempa. Here's the table structure and column data type. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. In example Count will give sum of the column with distinct. it is not a field from database. Multiple vehicles in the "Vehicles" table may have the same "Group" I would like to select all the first records in the "Vehicles" table by Distinct "Group". If you want to avoid this anonymous type here is the simple trick. 1509. Select(Function(r) r(“Item”). Distinct(**p. Rows select new { col1=dRow["dataColumn1"],col2=dRow["dataColumn2"]}). Distinct(new OperatorEqualityComparer()); The other option, which makes the database do the work, is to group by ID and take the first item in each group: var query = from p in dc. I am trying to get all the value from one column "Category", that is all the unique value, I don't want the list to be returned with duplicates. Distinct on multiple fields. EMAIL; How can I select multiple columns? Like I want to select res. 166. Field<string>("Something"))) But they are normally less clear. Key, Count = (from l in g select l. Distinct for var linq but it's still returning duplicate items (meaning having the same Id's). The following code returns a Dictionary<string,string> return db. Select multiple column in linq. Sep 10, 2008 · If your DBMS doesn't support distinct with multiple columns like this: select distinct(col1, col2) from table Multi select in general can be executed safely as follows: select distinct * from (select col1, col2 from table ) as x Aug 9, 2017 · This is my Linq Syntax which I am using to my entity model. Field(Of String)("B")). people . CompanyId, CompanyName = r. May 11, 2016 · Trying to do what a SQL query (SELECT DISTINCT (first,second),third FROM table) would do but I am doing it with LINQ and a datatable. Distinct(); which logically it should create an anonymous object with CategoryId and CategoryName as properties. Related. product. SelectMany(item => item). Using System. So basically I would like to write a query to pull out all Distinct "Groups" along with the entire record and add these to a list. AsEnumerable () where data. The following is the code I have attempted, but I cannot seem to get the query written correctly: Jul 13, 2010 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. distinct(); but I need results where r. I want to distinct one game one line. Distinct() See here: Linq Group on Multiple Fields - VB. Customers Select Key cus. Distinct(). Dec 25, 2015 · LINQ - Return rows with all columns of a table based on multiple distinct columns. Jun 5, 2023 · Select(Function(row) row. Text select data. Need to select multiple columns in Entity Framework, but Sep 9, 2011 · Selecting distinct and grouping by do the same thing, but if you group you can also have aggregate functions in the select list. DistinctBy(x => x. C# Linq SQL select Multiple columns to I have the following table structure. So I have a collection of objects. As strings are collection of character, you can apply extension methods to them too. Sum(row => row. Ask Question Asked 10 years, LINQ, how to select distinct with two columns. From it I want to extract all the unique pairs of a pair of particular properties, thusly: myObjectCollection. Jan 15, 2015 · select distinct studentname, subject, grade from studenttable; The student table has the following fields: studentid studentname subject grade The linq query I have now is: var students=dc. Count distinct elements across multiple columns. LogId (int) CustomerId (string) CustomerNa Aug 17, 2015 · C# doesn't know how to compare your Result instances. MyTable where SomeCondition select new { CompanyId = r. select r to select either an anonymous type like this: (from r in ctx. If I know the columns I need to select beforehand, I can use the answer from David Hoarser at Select distinct rows from datatable in Linq: May 13, 2011 · var query = dc. id Jun 15, 2015 · Solution 1: Simplest solution would be DefaultView. Jan 8, 2015 · 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: Select distinct using linq [duplicate] Ask Question Asked 11 years, 5 months ago. – Coding Flow Commented Sep 9, 2011 at 16:06 Mar 4, 2014 · Group & Aggregate multiple columns using LINQ. id_cliente = t021. YearOfRelease}"); Code language: C# (cs) Jul 2, 2022 · dt1. 2. beside to the three previous columns I have another one called 4)'Distance'. Select(m => new {m. The code below only selects 1 column. Dec 14, 2021 · I can do this with multiple linq queries: list1 = await context. I used this code to Oct 23, 2014 · LINQ to Entities - DISTINCT on one column. ) In MoreLINQ we have the DistinctBy operator which you could use: var distinct = list. IQueryable<string> objEmployee = null; objEmployee = from res in _db. Count() }; I have the following structure: Products Id Name Fields Id Name ProductFieldValues ProductId FieldId Value Where the FieldValues are mapped as a collection against the Product entity like so: Bag(x => x. public class LambdaComparer<T> : IEqualityComparer<T> { private readonly Func<T, T, bool> _expression; public LambdaComparer(Func<T, T, bool> lambda) { _expression = lambda; } public bool Equals(T x, T y) { return _expression(x, y); } public int GetHashCode(T obj) { /* If you just return 0 for the hash the Jun 15, 2018 · I have used the Distinct() method when selecting using linq, but I cannot find the correct syntax for ensuring that concatenated columns are distinct - see my efforts below, which currently fail with the message that "A key with that value has already been added". Linq, there's, of course, an extension method called Distinct. Linq to SQL Jun 7, 2013 · LINQ to SQL Select Distinct by Multiple Columns and return entire entity. id_Cliente, :pPOD FROM t020_clienti t020, t021_siti t021, T520_REL_STRUMENTI_SITI t520 WHERE t020. GroupBy(c=> c. Select(s => s. DbContext. Manufacturer. Where clause breaks instead. CompanyName, CompanyPriority = r. id_sito = t520. Key. In the simple case, it can be used with no parame May 27, 2011 · LINQ to DataSet, distinct by multiple columns. Entity. Issue: is i need both item and staus for each SFCA in a single linq query, how can we do that? Thanks in advance!! Oct 4, 2011 · I'm selecting multiple columns from a table (id, name). ToArray() converts the result to an array of strings. Oct 12, 2009 · Select Distinct from DataTable using Linq and C#. 4. My SQL equivalent is: Select distinct Level1Id, Level1Name from levels What I currently do is: db. Distinct(); EDIT: Placed the missing first curly brace. Select distinct rows in c# datatable on single column but return all columns LINQ Distinct on multiple Jul 14, 2010 · get distinct rows from datatable using Linq (distinct with mulitiple columns) Or try this. Rows select new { col1 = dRow["OrganizationID_int"] }). SUM for all columns Apr 15, 2017 · Now I want to select all rows from this list where combination of BiddedUserId and ProductId is unique, and if there is multiple rows satisfying this condition I want to select only the row which have the highest value in column BidAmount How can I achieve this? I have tried doing this by Grouping the items first by two columns and taking max Nov 22, 2012 · SQLでもグルーピングする方法はGroupByとDistinctと2とおりある。 ※厳密にいうと、意味が違うけど。 Linqで複数項目の重複排除は. For example, this is selecting distinct movies per director per year: foreach (var movie in moviesPerYear) Console. dt. Distinct() returns an indistinct value. Id. Table. Dim distinctValues As String() = MyDataTable. EMAIL == givenInfo || res. If you want all the heights as well, you need to group instead: Aug 23, 2012 · I have selected multiple columns from my table, but I don't know how to pass it to my view. You can select just the name and age into an anonymous type, and then use Distinct(): var results = context. is: Oct 4, 2011 · I'm selecting multiple columns from a table (id, name). WriteLine($"{movie. LINQ-to-Dataset. LINQ filter Elements based on two properties. 0. There are other articles where the query is somehow different with the way it retrieves the values and place it in a var. The rows 1 and 2 contains columns till UnitSqcNo same. com/cursos?idioma=engIn this video we'll use LINQ to do a Distinct operation in two properties. CategoryName}). ToTable. i want a linq query that takes out all the distinct rows from the column ‘PO’ thanks in advance !! Nov 27, 2012 · If you want to select only a subset of columns of your table, change. e. Aug 10, 2014 · I'm trying to create a linq statment that return an arrary. levels. var pList = db. Feb 24, 2014 · I'm having trouble writing the SQL code to select distinct contacts across 8 columns from an access table. Oct 15, 2021 · Get my Udemy courses with a discount: https://www. 6. I am stuck with one use case where i need to fetch 2 columns from a datatable: Here is the example: I have 3 columns: SF-Case, Item And Status(Only Item column has unique id’s) I need to get distinct SF-case For each SF-case, i need to find it’s corresponding Item and Status So far i am able to get distinct SF-case values and Item by using below ling Apr 1, 2016 · My table contains several columns and I need to select distinct rows in two specific columns using Linq. var prod = (from p in _context. var result = Context. ToArray. grade}). Operators. subject, s. ToString = sfca). Name**) p. Dim counts = (From row In loadedData Select row. Returns distinct elements from a sequence by using the default equality comparer to compare values. Multiple "order by" in LINQ. Text Jan 29, 2009 · LINQ-Like has nothing to do with preference, being "LINQ-like" has to do with looking like a different query language being embedded into C#, I prefer the fluent interface, coming from java streams, but it is NOT LINQ-Like. First()) This will retrieve the whole row not only Level1Id and Level1Name. studentname, s. So basically I merged multiple tables based on the ID, and I have various other columns as well somethings like this: Let me explain my required based on this image. Data. Try out with your criteria. Field(Of String)("Email")). Right, so I have an enumerable and wish to get distinct values from it. I created a Web Api in VS 2012. Create(p. Sep 19, 2014 · I think you are trying to get the Distinct Count() of Number field with ungrouped Sum() select multiple columns using linq and sum them up. The following code returns a Dictionary<string, Jul 31, 2015 · One key is that Linq-to-SQL and (the Linq-to-object activity commonly called) LINQ-to-Dataset are two very different things. How do I achieve a Distinct SQL query using Entity Framework when selecting multiple columns? Group By also does not work when the key is multiple columns. . Query that selects multiple columns ignores distinct: Feb 28, 2019 · One of the columns being "Group". I thought the group clause might help this, but it changes the return type to IGrouping. Sep 26, 2011 · Need to select multiple columns in Entity Framework, but need to get only distinct on single column 0 Querying distinct columns across rows filtering by another column. In general I want select all the rows with distinct model, unittype, unit and rest with greater CompId. I've read through a lot of sites and have tried adding a . Select into the query but the . ToDictionary(kvp => kvp. ewsolgp yrcunfe dksk tryygge nzy nkc ljeem mcri nzzq bui tvj gvw esu viar nbe