T-SQL的IN：Select ProductID, ProductName, CategoryIDFrom dbo.ProductsWhere CategoryID in (1, 2)T-SQL的NOT IN：Select ProductID, ProductName, CategoryIDFrom dbo.ProductsWhere CategoryID not in (1, 2)OrSelect ProductID, ProductName, CategoryIDFrom dbo.ProductsWhere not CategoryID in (1, 2)LINQ的IN：var queryResult = from p in db.Productswhere (new int?[] {1,2}).Contains(p.CategoryID)select p;LINQ的IN解析成SQL：SELECT [t0].[ProductID], [t0].[ProductName], [t0].[SupplierID], [t0].[CategoryID], [t0].[QuantityPerUnit], [t0].[UnitPrice], [t0].[UnitsInStock], [t0].[UnitsOnOrder], [t0].[ReorderLevel], [t0].[Discontinued] FROM [dbo].[Products]AS [t0]WHERE [t0].[CategoryID] IN (@p0, @p1)LINQ的NOT IN：var queryResult = from p in db.Productswhere ! (new int?[] {1,2}).Contains(p.CategoryID)select p;LINQ的NOT IN解析成SQL：SELECT [t0].[ProductID], [t0].[ProductName], [t0].[SupplierID], [t0].[CategoryID], [t0].[QuantityPerUnit], [t0].[UnitPrice], [t0].[UnitsInStock], [t0].[UnitsOnOrder], [t0].[ReorderLevel], [t0].[Discontinued] FROM [dbo].[Products]AS [t0]WHERE NOT [t0].[CategoryID] IN (@p0, @p1)