GROUPING
Returns a bit mask indicating which GROUP BY expressions are not included in the current grouping set. Bits are assigned with the rightmost argument corresponding to the least-significant bit; each bit is 0 if the corresponding expression is included in the grouping criteria of the grouping set generating the current result row, and 1 if it is not included.
SQL Syntax
GROUPING ( expr [, expr, ...] )
Note:
GROUPING can only be used with GROUPING SETS, ROLLUP, or CUBE, and its arguments must be in the grouping sets list.Arguments
Grouping sets items.
Return Type
UInt32.
SQL Examples
select a, b, grouping(a), grouping(b), grouping(a,b), grouping(b,a) from t group by grouping sets ((a,b),(a),(b), ()) ;
+------+------+-------------+-------------+----------------+----------------+
| a | b | grouping(a) | grouping(b) | grouping(a, b) | grouping(b, a) |
+------+------+-------------+-------------+----------------+----------------+
| NULL | A | 1 | 0 | 2 | 1 |
| a | NULL | 0 | 1 | 1 | 2 |
| b | A | 0 | 0 | 0 | 0 |
| NULL | NULL | 1 | 1 | 3 | 3 |
| a | A | 0 | 0 | 0 | 0 |
| b | B | 0 | 0 | 0 | 0 |
| b | NULL | 0 | 1 | 1 | 2 |
| a | B | 0 | 0 | 0 | 0 |
| NULL | B | 1 | 0 | 2 | 1 |
+------+------+-------------+-------------+----------------+----------------+