grouping_id

grouping_id is used to distinguish the grouping statistics results of the same grouping standard.

Syntax

GROUPING_ID(expr)

Examples

MySQL > SELECT COL1,GROUPING_ID(COL2) AS 'GroupingID' FROM tbl GROUP BY ROLLUP (COL1, COL2);
+------+------------+
| COL1 | GroupingID |
+------+------------+
| NULL |          1 |
| 2.20 |          1 |
| 2.20 |          0 |
| 1.10 |          1 |
| 1.10 |          0 |
+------+------------+