DATE CURDATE()
获取当前的日期,以DATE类型返回
MySQL > SELECT CURDATE();
+------------+
| CURDATE() |
+------------+
| 2019-12-20 |
+------------+
MySQL > SELECT CURDATE() + 0;
+---------------+
| CURDATE() + 0 |
+---------------+
| 20191220 |
+---------------+
CURDATE