Question

Basically I want to fetch some data from tblvw1. Another table contains possible ids within a column which is stored as concatenated string, for example: "1|2|3|4". Next I have tried to get the result by the following query:

SELECT x FROM tblname1 
WHERE id IN (SELECT REPLACE(content,'|',',') FROM tblname2 WHERE dataid = y )

AS result I only get the first value, the other data wasn't fetched. I suppose that the subquery will result in this form:

SELECT x FROM tblname1 WHERE id IN ('1,2,3,4')

but i want to have this subquery either as

 SELECT x FROM tblname1 WHERE id IN (1,2,3,4)

or

  SELECT x FROM tblname1 WHERE id IN ('1','2','3','4')

Any Idea?

Answer 1

您可以使用find_in_set功能吗？

SELECT x FROM tblname1 t1
inner join tblname2 t2 on find_in_set (t1.id, REPLACE(t2.content,'|',',')) > 0
where t2.dataid = 'y';

find_in_set函数返回第二个参数中第一个参数的位置。如果结果为> 0，则找到第一个参数。

请参阅http://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_find-in-set

mysql passing data to in

1 个答案: