SelectQueryFluentBuilder.GroupFilter(String) Method

Specifies the filter criteria to add to the current query containing grouped/aggregated columns.

Namespace: DevExpress.DataAccess.Sql

Assembly: DevExpress.DataAccess.v21.2.dll

NuGet Packages: DevExpress.DataAccess, DevExpress.Win.Design

Declaration

C#

public SelectQueryFluentBuilder GroupFilter(
    string groupFilterString
)

VB.NET

Public Function GroupFilter(
    groupFilterString As String
) As SelectQueryFluentBuilder

Parameters

Name	Type	Description
groupFilterString	String	A String value, specifying the filter criteria.

Returns

Type	Description
SelectQueryFluentBuilder	A SelectQueryFluentBuilder object.

Remarks

In the following example, a query uses an inner join to select columns from separate data tables sharing a common column key.

C#

using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;
using DevExpress.Xpo.DB;
// ...

private SqlDataSource BindToData() {
    // Create a data source with the required connection parameters. 
    Access97ConnectionParameters connectionParameters =
    new Access97ConnectionParameters("../../Data/nwind.mdb", "", "");
    SqlDataSource ds = new SqlDataSource(connectionParameters);

    // Join the Categories and Products table by the CategoryID column. 
    // Return the list of categories and the number of products in each category. 
    // Sort the categories by the number of products in them. 
    // The included categories must contain a specific number of products.
    SelectQuery query = SelectQueryFluentBuilder
        .AddTable("Categories")
        .SelectColumn("CategoryName")
        .GroupBy("CategoryName")
        .Join("Products", "CategoryID")
        .SelectColumn("ProductName", AggregationType.Count, "ProductCount")
        .SortBy("ProductName", AggregationType.Count, System.ComponentModel.ListSortDirection.Descending)
        .GroupFilter("[ProductCount] > 7")
        .Build("MyQuery");

    // Add the query to the collection and return the data source. 
    ds.Queries.Add(query);
    return ds;
}

VB.NET

Imports DevExpress.DataAccess.ConnectionParameters
Imports DevExpress.DataAccess.Sql
Imports DevExpress.Xpo.DB
' ... 

Private Function BindToData() As SqlDataSource
    ' Create a data source with the required connection parameters. 
    Dim connectionParameters As New Access97ConnectionParameters("../../Data/nwind.mdb", "", "")
    Dim ds As New SqlDataSource(connectionParameters)

    ' Join the Categories and Products table by the CategoryID column. 
    ' Return the list of categories and the number of products in each category. 
    ' Sort the categories by the number of products in them. 
    ' The included categories must contain a specific number of products.
    Dim query As SelectQuery = SelectQueryFluentBuilder.
        AddTable("Categories").
        SelectColumn("CategoryName").
        GroupBy("CategoryName").
        Join("Products", "CategoryID").
        SelectColumn("ProductName", AggregationType.Count, "ProductCount").
        SortBy("ProductName", AggregationType.Count, System.ComponentModel.ListSortDirection.Descending).
        GroupFilter("[ProductCount] > 7").
        Build("MyQuery")

    ' Add the query to the collection and return the data source. 
    ds.Queries.Add(query)
    Return ds
End Function