MYSQL查询字段中包含以逗号分隔的字符串

建表 CREATE TABLE test(id int(6) NOT NULL AUTO_INCREMENT,PRIMARY KEY (id),pname VARCHAR(20) NOT NULL,pnum VARCHAR(50) NOT NULL); 插入测试数据 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字段中包含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,比如33也被查找出来了,不过MYSQL还可以使用正则,挺有意思的 find_in_set()函数返回的所在的位置,如果不存在就返回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) 还可以用来排序,如下; 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) 如果想要按照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)

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