Wie finden wir in MySQL heraus, welches Quartal das aktuelle Datum oder ein bestimmtes Datum ist?

mysql> Select EXTRACT(Quarter from '2017-07-29');
+------------------------------------+
| EXTRACT(Quarter from '2017-07-29') |
+------------------------------------+
|                                  3 |
+------------------------------------+
1 row in set (0.00 sec)

mysql> Select EXTRACT(Quarter from now());
+-----------------------------+
| EXTRACT(Quarter from now()) |
+-----------------------------+
|                           4 |
+-----------------------------+
1 row in set (0.00 sec)