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For more information, see WITH common_table_expression (Transact-SQL). For information about table hints, see Table Hints (Transact-SQL).TOP ( ) Specifies one or more table hints that are allowed for a target table. @Note When referencing the Unicode character data types nchar, nvarchar, and ntext, 'expression' should be prefixed with the capital letter ' N'.For more information, see Query Hints (Transact-SQL). All char and nchar columns are right-padded to the defined length.Use the @@ROWCOUNT function to return the number of inserted rows to the client application. If ANSI_PADDING is set to OFF, all trailing spaces are removed from data inserted into varchar and nvarchar columns, except in strings that contain only spaces. If ANSI_PADDING is set to ON, trailing spaces are inserted.
Specifies the temporary named result set or view, also known as common table expression (CTE), defined within the scope of the UPDATE statement.After whichever method you use, add an unique constraint on the column to ensure data integrity.For Methods 1 and 2, this can be done within the single statement or within a user transaction (not shown), and should be done within the user transaction in Method 3.In particular, filter or join conditions applied on the result of one of those calls have no effect on the results of the other.Specifies the condition to be met for the rows to be updated.