Datatable group by multiple columns c#

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WebJan 29, 2024 · Using c# Sytem.Linqhere. I wanted to find the duplicates in my table. A duplicate is defined when the combination of three columns already exists in the table. For example, below is a duplicate record: Row Id Name Value Status 1 1 Peter 1 New 2 1 Peter 1 Old 3 1 Peter 1 Pending 4 2 Peter 1 New 5 2 Sandy 2 Old WebThis split-apply-combine strategy allows for a number of operations: Aggregations per group, Transformation of a column or columns, where the shape of the dataframe is maintained, Filtration, where some data are kept and the others discarded, based on a condition or conditions.

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Web1 Answer Sorted by: 44 That's pretty easy - just use the Sum extension method on the group. var groupedData = from b in dataTable.AsEnumerable () group b by b.Field ("chargetag") into g select new { ChargeTag = g.Key, Count = g.Count (), ChargeSum = g.Sum (x => x.Field ("charge")) }; WebApr 9, 2024 · Into Group Select Group (0)).ToArray ().CopyToDataTable () Create a Create a List of strings ListA= (From p In DT1.AsEnumerable () Group By x= New With { Key.a =p.Item (“OrderID”),Key.b=p.Item (“SerialNo”)} Into GroupA= Group Select Convert.ToString (GroupA.Sum (Function (x) Convert.ToDouble (x.Item (“Amount”).ToString)))).ToList () imgur feeds

c # using linq to group by multiple columns in a datatable

Web我正在努力使LINQ Group By成為我的大腦，並且在我的知識上有一個小缺陷。我想按多個列進行分組，這些列我知道可以對new 和某些字段進行處理。唯一的問題是，基於某些查詢字符串值，我可能會或可能不想將它們包括在內。我有這個：我可能希望我的匿名對象僅具有第一個字段，或最后兩個字段 ... WebNov 5, 2016 · Either a (very) old version of data.table, or there was some other error. ?data.table says: " by - A single unquoted column name, a list () of expressions of column names, a single character string containing comma separated column names, or a character vector of column names." WebJun 20, 2024 · DataTable dt = GetDataTableFromExcel (); List dts = dt.AsEnumerable () .GroupBy (row => row.Field< string > ( "OUTLET NAME " )) .Select … imgur fishing gif

c# - Extracting Specific Columns from a DataTable - Stack Overflow

WebC# 将两个Linq查询数据放入两个单独的datatable列中,c#,linq,datatable,multiple-columns,C#,Linq,Datatable,Multiple Columns,我是linq的新手，在这个问题上已经被困了几天。下面是我的示例的xml 您在代码中有一些假设，即I_表(模式)日期(日期)表和I_表(模式)类型(类型)表将始终匹配。 WebAug 18, 2015 · This is the content of DataTable which is returned from database. Now I just would like to group the results by User Id and loop through to out put result. foreach (DataRow userRow in DataTableGroupedByUser){foreach (DataRow restOfColumns in AddressAndPhoneRows){Output user details } } The output I would get should be: list of postcodes victoriaWebC# Datatable使用行修改列,c#,datatable,multiple-columns,C#,Datatable,Multiple Columns,我想在Datatable中修改我的表。我知道我必须使用linq并对结果进行分组。 imgur facebook

"WebSep 23, 2024 · library(data.table) The column at a specified index can be extracted using the list subsetting, i.e. [, operator. The new column can be added in the second … " - Datatable group by multiple columns c#

Datatable group by multiple columns c#

http://duoduokou.com/csharp/17561482170751830840.html WebMar 16, 2013 · var result = from r in dtResults.AsEnumerable () group r by r.Field ("ID") into IdGroup let row = IdGroup.First () select new { ID = IdGroup.Key, Age = row.Field ("Age"), LastName = row.Field ("Last_Name"), FirstName = row.Field ("First_Name"), MotherName = row.Field ("Mother_Name"), FatherName = row.Field ("Father_Name"), Marks = …

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WebSep 14, 2024 · In this article. Data binding is a common use of DataTable object. The CopyToDataTable method takes the results of a query and copies the data into a DataTable, which can then be used for data binding.When the data operations have been performed, the new DataTable is merged back into the source DataTable.. The … WebMar 8, 2024 · Is it possible to have a Linq GroupBy that specifies multiple columns in an AsEnumerable DataTable. I have successfully grouped based on a single column using s.Field (colName) as the GroupBy parameter, but can't find a way to specify multiple columns. See the desired code below. Thanks.

WebC# Datatable使用行修改列,c#,datatable,multiple-columns,C#,Datatable,Multiple Columns,我想在Datatable中修改我的表。我知道我必须使用linq并对结果进行分组。 WebSep 29, 2015 · var products = new DataTable (); products.Columns.Add ("ProductName", typeof (string)); products.Columns.Add ("Qty1", typeof (int)); products.Columns.Add ("Qty2", typeof (int)); products.Columns.Add ("Qty3", typeof (int)); products.Rows.Add (new object [] {"A", 2, 0, 4}); products.Rows.Add (new object [] {"A", 0, 4, 5}); …

WebApr 27, 2011 · To find the code pointed out by the old link, go to the grouping section and click any of the samples listed there. We have take the lead names in an array. then take the source datatable and filter it based on the lead names and add to a new DataTable: #region Grouping by Teamlead DataTable dtGroup = new DataTable (); dtGroup = … WebMar 24, 2024 · Thanks you method, it basically solve my problem. But I still have a deep question, if there are a lot of columns, in your solution, I have to define each column the the new { column1 = xx, column2 = yy, *****}. In fact, what I really want is just get the sum in the value1, and value2, the other column will use the default value. –

WebDec 29, 2024 · A single student can have multiple addresses that's why after fetching the data from excel into data table I am first applying group by and then converting it into a dictionary. I have applied the group by on 2 columns StudentId and StudentTempId. Because of which two keys are getting created when converting to a dictionary.

WebGroup by multiple columns: df[:, sum(f.Number), by('Fruit', 'Name')] 10 rows × 3 columns By column position: df[:, sum(f.Number), by(f[0])] 3 rows × 2 columns By boolean expression: df[:, sum(f.Number), by(f.Fruit == "Apples")] 2 rows × 2 columns Combination of column and boolean expression: df[:, sum(f.Number), by(f.Name, f.Fruit == "Apples")] imgur firstWebMay 12, 2016 · A group by might be more suited to this scenario. It will group the columns into distinct rows and return a count if desired. i.e. var groups = table.GroupBy (_ => new {_.Key1, _.Key2, _.KeyN}) .Select (_ => new { key = _.Key, count = _.Count ()); This is untested code, but should help point you in the correct direction. imgur foothttp://duoduokou.com/csharp/17561482170751830840.html list of postmasters generalWebSep 23, 2024 · library(data.table) The column at a specified index can be extracted using the list subsetting, i.e. [, operator. The new column can be added in the second argument assigned to a predefined or a user-defined function defined over a set of columns of data.table. The by argument can be added to group the data using a set of columns … imgur foodWebAug 31, 2024 · A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. imgur footballWebMar 28, 2013 · Select TeamID, Count(*) From Table Group By TeamID but in my application, the only way I know how to handle this would be something like this: … imgur for gta link picsWebAug 28, 2012 · When using group by clause all items are divided into groups and for each group only one item is returned, so in order to refer to a column, you have to either put it in the group by clause or use an aggregation method on … list of postmillennial theologians