Is an aggregate function that causes an additional column to be output with a value of 1 when the row is added by either the CUBE or ROLLUP operator, or 0 when the row is not the result of CUBE or ROLLUP.
Grouping is allowed only in the select list associated with a GROUP BY clause that contains either the CUBE or ROLLUP operator.
GROUPING ( column_name )
Is a column in a GROUP BY clause to test for CUBE or ROLLUP null values.
Grouping is used to distinguish the null values that are returned by CUBE and ROLLUP from standard null values. The NULL returned as the result of a CUBE or ROLLUP operation is a special use of NULL. This acts as a column placeholder in the result set and means all.
The following example groups
SalesQuota and aggregates
SaleYTD amounts. The
GROUPING function is applied to the
USE AdventureWorks; GO SELECT SalesQuota, SUM(SalesYTD) 'TotalSalesYTD', GROUPING(SalesQuota) AS 'Grouping' FROM Sales.SalesPerson GROUP BY SalesQuota WITH ROLLUP; GO
The result set shows two null values under
SalesQuota. The first
NULL represents the group of null values from this column in the table. The second
NULL is in the summary row added by the ROLLUP operation. The summary row shows the
TotalSalesYTD amounts for all
SalesQuota groups and is indicated by
1 in the
Here is the result set.
SalesQuota TotalSalesYTD Grouping --------- ------------- -------- NULL 1533087.5999 0 250000.00 33461260.59 0 300000.00 9299677.9445 0 NULL 44294026.1344 1 (4 row(s) affected)
12 December 2006