Interprets the SYS_CHANGE_COLUMNS value that is returned by the CHANGETABLE(CHANGES …) function. This enables an application to determine whether the specified column is included in the values that are returned for SYS_CHANGE_COLUMNS.
CHANGE_TRACKING_IS_COLUMN_IN_MASK ( column_id , change_columns )
Is the ID of the column that is being checked. The column ID can be obtained by using the COLUMNPROPERTY function.
Is the binary data from the SYS_CHANGE_COLUMNS column of the CHANGETABLE data.
CHANGE_TRACKING_IS_COLUMN_IN_MASK returns the following values.
|0||The specified column is not in the change_columns list.|
|1||The specified column is in the change_columns list.|
CHANGE_TRACKING_IS_COLUMN_IN_MASK does not perform any checks to validate the column_id value or that the change_columns parameter was obtained from the table from which the column_id was obtained.
The following example determines whether the
Salary column of the
Employees table was updated. The
COLUMNPROPERTY function returns the column ID of the
Salary column. The
@change_columns local variable must be set to the results of a query by using CHANGETABLE as a data source.
SET @SalaryChanged = CHANGE_TRACKING_IS_COLUMN_IN_MASK (COLUMNPROPERTY(OBJECT_ID('Employees'), 'Salary', 'ColumnId') ,@change_columns);