首先，我们创建一个逗号分隔字符串。

CREATE TABLE test(id int(6) NOT NULL AUTO_INCREMENT,PRIMARY KEY (id),pname VARCHAR(20) NOT NULL,pnum VARCHAR(50) NOT NULL);

然后插入带有逗号分隔的測试数据

INSERT INTO test(pname,pnum) VALUES('产品1','1,2,4');

INSERT INTO test(pname,pnum) VALUES('产品2','2,4,7');

INSERT INTO test(pname,pnum) VALUES('产品3','3,4');

INSERT INTO test(pname,pnum) VALUES('产品4','1,7,8,9');

INSERT INTO test(pname,pnum) VALUES('产品5','33,4');

查找pnum字段中包括3或者9的记录

mysql> SELECT * FROM test WHERE find_in_set('3',pnum) OR find_in_set('9',pnum);

+----+-------+---------+

| id | pname | pnum    |

+----+-------+---------+

|  3 | 产品3 | 3,4     |

|  4 | 产品4 | 1,7,8,9 |

+----+-------+---------+

2 rows in set (0.03 sec)

使用正则

mysql> SELECT * FROM test WHERE pnum REGEXP '(3|9)';

+----+-------+---------+

| id | pname | pnum    |

+----+-------+---------+

|  3 | 产品3 | 3,4     |

|  4 | 产品4 | 1,7,8,9 |

|  5 | 产品5 | 33,4    |

+----+-------+---------+

3 rows in set (0.02 sec)

这样会产生多条记录。比方33也被查找出来了，只是MYSQL还能够使用正则，挺有意思的

find_in_set()函数返回的所在的位置，假设不存在就返回0

mysql> SELECT find_in_set('e','h,e,l,l,o');

+------------------------------+

| find_in_set('e','h,e,l,l,o') |

+------------------------------+

|                            2 |

+------------------------------+

1 row in set (0.00 sec)

还能够用来排序，例如以下;

mysql> SELECT * FROM TEST WHERE id in(4,2,3);

+----+-------+---------+

| id | pname | pnum    |

+----+-------+---------+

|  2 | 产品2 | 2,4,7   |

|  3 | 产品3 | 3,4     |

|  4 | 产品4 | 1,7,8,9 |

+----+-------+---------+

3 rows in set (0.03 sec)

假设想要依照ID为4，2。3这样排序呢？

mysql> SELECT * FROM TEST WHERE id in(4,2,3) ORDER BY find_in_set(id,'4,2,3');

+----+-------+---------+

| id | pname | pnum    |

+----+-------+---------+

|  4 | 产品4 | 1,7,8,9 |

|  2 | 产品2 | 2,4,7   |

|  3 | 产品3 | 3,4     |

+----+-------+---------+

3 rows in set (0.03 sec)