Identifies whether the specified update mask indicates that the specified column has been updated in the associated change row.
You can use this function to extract information from an update mask returned in a query for change data. It is most useful in post-processing the update mask when you need to know whether a particular column in the associated change row has been modified. For more information, see About Change Data Capture (SQL Server).
When this information will be returned as part of a change data query, we recommend that you use the functions sys.fn_cdc_get_column_ordinal and sys.fn_cdc_is_bit_set instead of this function. Use the function fn_cdc_get_column_ordinal before querying for change data so that the desired column ordinal is only computed once. Use fn_cdc_is_bit_set within the query to extract the information from the update mask for each returned row.