如何在MySQL中获取上个月的第一天？

借助以下 MySQL 查询，我们可以获得上个月的第一天 -

mysql> SELECT DATE_FORMAT(CURDATE() - INTERVAL 1 MONTH,'%Y-%m-01') AS 'FIRST DAY OF PREVOIUS MONTH';
+-----------------------------+
| FIRST DAY OF PREVOIUS MONTH |
+-----------------------------+
| 2017-09-01                  |
+-----------------------------+
1 row in set (0.00 sec)