CHANGE_TRACKING_IS_COLUMN_IN_MASK (Transact-SQL)
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.
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Transact-SQL Syntax Conventions
Syntax
CHANGE_TRACKING_IS_COLUMN_IN_MASK ( column_id , change_columns )
Arguments
column_id
Is the ID of the column that is being checked. The column ID can be obtained by using the COLUMNPROPERTY function.change_columns
Is the binary data from the SYS_CHANGE_COLUMNS column of the CHANGETABLE data.
Return Type
bit
Return Values
CHANGE_TRACKING_IS_COLUMN_IN_MASK returns the following values.
Return value |
Description |
|---|---|
0 |
The specified column is not in the change_columns list. |
1 |
The specified column is in the change_columns list. |
Remarks
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.
Examples
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);