grouping_id
Description
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 |
+------+------------+