mysql locate()函数

mysql> select * from test;
+----+------------+-------+-----------+
| id | name       | score | subject   |
+----+------------+-------+-----------+
|  1 | xiaoming   |    89 | shuxue    |
|  2 | xiaohong   |    89 | shuxue    |
|  3 | xiaohong   |    80 | english   |
|  4 | xiaohong   |    80 | physics   |
|  5 | xiaohong   |    80 | astronaut |
|  6 | xiaoming   |    80 | physics   |
|  7 | xiaoming   |    80 | astronaut |
|  8 | xiaoming   |    80 | english   |
|  9 | xiaobai    |    80 | astronaut |
| 10 | 1.2xiaobai |    80 | english   |
| 11 | 2.2xiaobai |    80 | physics   |
| 12 | 3xiaobai   |    80 | shuxue    |
| 13 | 123xiaohei |    80 | astronaut |
| 14 | xiaohei    |    80 | shuxue    |
| 15 | xiaohei    |    80 | physics   |
| 16 | .12xiaohei |    80 | english   |
+----+------------+-------+-----------+
16 rows in set (0.00 sec)


mysql> select locate("xiao",name) from test where id=3;
+---------------------+
| locate("xiao",name) |
+---------------------+
|                   1 |
+---------------------+
1 row in set (0.00 sec)


mysql> select locate("iao",name) from test where id=3;
+--------------------+
| locate("iao",name) |
+--------------------+
|                  2 |
+--------------------+
1 row in set (0.00 sec)


mysql> select locate("o",name) from test where id=3;
+------------------+
| locate("o",name) |
+------------------+
|                4 |
+------------------+
1 row in set (0.00 sec)


mysql> select locate("o",name,5) from test where id=3;
+--------------------+
| locate("o",name,5) |
+--------------------+
|                  6 |
+--------------------+
1 row in set (0.00 sec)