用IN选择会产生错误的结果

Question

Field editors value '3,2,4'

sql statement

SELECT * FROM `table` where '3' in (editors)

result 1 row = correct

SELECT * FROM `table` where '2' in (editors)

result 0 row = not correct.

I presume the value '3,2,4' is treated as a string, how to solve this?

Answer 1

You'll have to use FIND_IN_SET() , or a hideous construct like

  WHERE editors='2' 
    OR editors LIKE '2,%'
    OR editors LIKE '%,2,%'
    OR editors LIKE '%,2'

Right now your query is being interpreted as

 WHERE '2' IN ('1,2,3')
 a.k.a
 WHERE '2' = '1,2,3'

and not

 WHERE '2' IN ('1', '2', '3')
 a.k.a.
 WHERE '2' = '1' OR '2' = '2' OR '2' = '3'

like you want it to. WHERE