SELECT DATE_TIME ,COUNT(1) FROM
( SELECT ID,
CASE CEILING(MINUTE(TIMES)/15)
WHEN 1 THEN '2019-12-25 11:00'
WHEN 2 THEN '2019-12-25 11:15'
WHEN 3 THEN '2019-11-25 11:30'
ELSE '2019-12-25 11:45' END AS DATE_TIME
FROM TEST_20200313)T
GROUP BY DATE_TIME;
+------------------+----------+
| DATE_TIME | COUNT(1) |
+------------------+----------+
| 2019-12-25 11:00 | 4 |
| 2019-12-25 11:15 | 2 |
| 2019-11-25 11:30 | 1 |
+------------------+----------+
3 rows in set (0.02 sec)
