mysql 通配符%以及_

%匹配任意长度

_ 匹配单个字符

mysql> select * from table1;
+----------+------------+-----+---------------------+-------+
| name_new | transactor | pid | order_date          | price |
+----------+------------+-----+---------------------+-------+
| 1hahha   | 1xiaohong  |   1 | 2019-08-04 20:45:47 |     0 |
| 2hahha   | 2xiaohong  |   2 | 2019-08-04 20:45:57 |     0 |
| 3hahha   | 3xiaohong  |   3 | 2019-08-04 20:46:02 |     0 |
| 4hahha   | 4xiaohong  |   4 | 2019-08-04 20:46:05 |     0 |
| 3hahha   | bob        |   5 | 2019-08-04 20:46:08 |     0 |
| 3hahha   | lee        |   6 | 2019-08-04 20:46:12 |     0 |
| 3hahha   | lee        |   7 | 2019-08-04 21:56:01 |     0 |
| 3hahha   | lee        |   8 | 2019-08-04 21:56:10 |     0 |
| 3hahha   | bob        |   9 | 2019-08-04 21:56:18 |     0 |
| 3hahha   | bob        |  10 | 2019-08-04 21:56:26 |     0 |
+----------+------------+-----+---------------------+-------+
10 rows in set (0.00 sec)


mysql> select * from table1 where transactor like "%xiaohong";
+----------+------------+-----+---------------------+-------+
| name_new | transactor | pid | order_date          | price |
+----------+------------+-----+---------------------+-------+
| 1hahha   | 1xiaohong  |   1 | 2019-08-04 20:45:47 |     0 |
| 2hahha   | 2xiaohong  |   2 | 2019-08-04 20:45:57 |     0 |
| 3hahha   | 3xiaohong  |   3 | 2019-08-04 20:46:02 |     0 |
| 4hahha   | 4xiaohong  |   4 | 2019-08-04 20:46:05 |     0 |
+----------+------------+-----+---------------------+-------+
4 rows in set (0.00 sec)


mysql> select * from table1 where transactor like "xiaohong";
Empty set (0.00 sec)


mysql> select * from table1 where transactor like "%xiao";
Empty set (0.00 sec)


mysql> select * from table1 where transactor like "%xiao%";
+----------+------------+-----+---------------------+-------+
| name_new | transactor | pid | order_date          | price |
+----------+------------+-----+---------------------+-------+
| 1hahha   | 1xiaohong  |   1 | 2019-08-04 20:45:47 |     0 |
| 2hahha   | 2xiaohong  |   2 | 2019-08-04 20:45:57 |     0 |
| 3hahha   | 3xiaohong  |   3 | 2019-08-04 20:46:02 |     0 |
| 4hahha   | 4xiaohong  |   4 | 2019-08-04 20:46:05 |     0 |
+----------+------------+-----+---------------------+-------+
4 rows in set (0.00 sec)


mysql> select * from table1 where transactor like "_xiao%";
+----------+------------+-----+---------------------+-------+
| name_new | transactor | pid | order_date          | price |
+----------+------------+-----+---------------------+-------+
| 1hahha   | 1xiaohong  |   1 | 2019-08-04 20:45:47 |     0 |
| 2hahha   | 2xiaohong  |   2 | 2019-08-04 20:45:57 |     0 |
| 3hahha   | 3xiaohong  |   3 | 2019-08-04 20:46:02 |     0 |
| 4hahha   | 4xiaohong  |   4 | 2019-08-04 20:46:05 |     0 |
+----------+------------+-----+---------------------+-------+
4 rows in set (0.00 sec)