MYSQL中利用select查詢某欄位中包含以逗號分隔的字串的記錄方法，mysqlselect

MYSQL中利用select查詢某欄位中包含以逗號分隔的字串的記錄方法，mysqlselect

首先我們建立一張帶有逗號分隔的字串。CREATE TABLE test(id int(6) NOT NULL AUTO_INCREMENT,PRIMARY KEY (id),pname VARCHAR(20) NOT NULL,pnum VARCHAR(50) NOT NULL);然後插入帶有逗號分隔的測試資料INSERT INTO test(pname,pnum) VALUES('產品1','1,2,4');INSERT INTO test(pname,pnum) VALUES('產品2','2,4,7');INSERT INTO test(pname,pnum) VALUES('產品3','3,4');INSERT INTO test(pname,pnum) VALUES('產品4','1,7,8,9');INSERT INTO test(pname,pnum) VALUES('產品5','33,4');尋找pnum欄位中包含3或者9的記錄mysql> SELECT * FROM test WHERE find_in_set('3',pnum) OR find_in_set('9',pnum);+----+-------+---------+| id | pname | pnum    |+----+-------+---------+|  3 | 產品3 | 3,4     ||  4 | 產品4 | 1,7,8,9 |+----+-------+---------+2 rows in set (0.03 sec)使用正則mysql> SELECT * FROM test WHERE pnum REGEXP '(3|9)';+----+-------+---------+| id | pname | pnum    |+----+-------+---------+|  3 | 產品3 | 3,4     ||  4 | 產品4 | 1,7,8,9 ||  5 | 產品5 | 33,4    |+----+-------+---------+3 rows in set (0.02 sec)這樣會產生多條記錄，比如33也被尋找出來了，不過MYSQL還可以使用正則，挺有意思的find_in_set()函數返回的所在的位置，如果不存在就返回0mysql> 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)還可以用來排序，如下;mysql> SELECT * FROM TEST WHERE id in(4,2,3);+----+-------+---------+| id | pname | pnum    |+----+-------+---------+|  2 | 產品2 | 2,4,7   ||  3 | 產品3 | 3,4     ||  4 | 產品4 | 1,7,8,9 |+----+-------+---------+3 rows in set (0.03 sec)如果想要按照ID為4，2，3這樣排序呢？mysql> SELECT * FROM TEST WHERE id in(4,2,3) ORDER BY find_in_set(id,'4,2,3');+----+-------+---------+| id | pname | pnum    |+----+-------+---------+|  4 | 產品4 | 1,7,8,9 ||  2 | 產品2 | 2,4,7   ||  3 | 產品3 | 3,4     |+----+-------+---------+3 rows in set (0.03 sec) 

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select * from robot where instr('ABCD',key)>0