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)