https://www.cnblogs.com/sea-stream/p/11299667.html
给的几个例子很直观，直接贴过来啦。docker里面用的mysql，最近可能会查得比较多。
mysql> select * from table1;
+----------+------------+-----+---------------------+
| name_new | transactor | pid | order_date |
+----------+------------+-----+---------------------+
| 1hahha | 1xiaohong | 1 | 2019-08-04 20:45:47 |
| 2hahha | 2xiaohong | 2 | 2019-08-04 20:45:57 |
| 3hahha | 3xiaohong | 3 | 2019-08-04 20:46:02 |
| 4hahha | 4xiaohong | 4 | 2019-08-04 20:46:05 |
| 3hahha | bob | 5 | 2019-08-04 20:46:08 |
| 3hahha | lee | 6 | 2019-08-04 20:46:12 |
+----------+------------+-----+---------------------+
6 rows in set (0.01 sec)
mysql> select * from table1 where date(order_date)='2019-08-04';
+----------+------------+-----+---------------------+
| name_new | transactor | pid | order_date |
+----------+------------+-----+---------------------+
| 1hahha | 1xiaohong | 1 | 2019-08-04 20:45:47 |
| 2hahha | 2xiaohong | 2 | 2019-08-04 20:45:57 |
| 3hahha | 3xiaohong | 3 | 2019-08-04 20:46:02 |
| 4hahha | 4xiaohong | 4 | 2019-08-04 20:46:05 |
| 3hahha | bob | 5 | 2019-08-04 20:46:08 |
| 3hahha | lee | 6 | 2019-08-04 20:46:12 |
+----------+------------+-----+---------------------+
6 rows in set (0.00 sec)
mysql> select * from table1 where date(order_date) between '2019-08-04' and '2019-08-04';
+----------+------------+-----+---------------------+
| name_new | transactor | pid | order_date |
+----------+------------+-----+---------------------+
| 1hahha | 1xiaohong | 1 | 2019-08-04 20:45:47 |
| 2hahha | 2xiaohong | 2 | 2019-08-04 20:45:57 |
| 3hahha | 3xiaohong | 3 | 2019-08-04 20:46:02 |
| 4hahha | 4xiaohong | 4 | 2019-08-04 20:46:05 |
| 3hahha | bob | 5 | 2019-08-04 20:46:08 |
| 3hahha | lee | 6 | 2019-08-04 20:46:12 |
+----------+------------+-----+---------------------+
6 rows in set (0.00 sec)
mysql> select * from table1 where order_date between '2019-08-04 20:45:47' and '2019-08-04 20:46:08';
+----------+------------+-----+---------------------+
| name_new | transactor | pid | order_date |
+----------+------------+-----+---------------------+
| 1hahha | 1xiaohong | 1 | 2019-08-04 20:45:47 |
| 2hahha | 2xiaohong | 2 | 2019-08-04 20:45:57 |
| 3hahha | 3xiaohong | 3 | 2019-08-04 20:46:02 |
| 4hahha | 4xiaohong | 4 | 2019-08-04 20:46:05 |
| 3hahha | bob | 5 | 2019-08-04 20:46:08 |
+----------+------------+-----+---------------------+
5 rows in set (0.00 sec)