SELECT A.id, A.title,
FROM (`table`) as A
WHERE A.active = '1'
AND A.id IN (SELECT GROUP_CONCAT(B.id) from B where user = 3)
If i launch subquery SELECT GROUP_CONCAT(B.id) from B where user = 3
only, i obtain 1,2,3,4. But if i launch entire query i obtain only one row.
But if i try to substitute the subquery with its value (1,2,3,4)
SELECT A.id, A.title,
FROM (`table`) as A
WHERE A.active = '1'
AND A.id IN (1,2,3,4)
i obtain the 4 rows ... as i need.
Where is my error ?
MySQL is seeing the subquery return only a single field/row, and therefore treats it as something like:
... and A.id IN ('1,2,3,4')
which boils down to A.id = '1,2,3,4'
.
For an 'in' query, there's no need for the group_concat stuff, simply do:
... and A.id IN (select B.id FROM b where user = 3)
SELECT name
FROM test
WHERE salry
IN (
SELECT GROUP_CONCAT( CONCAT('''', salry,'''' ) )
FROM test group by salry
)
this concat will append the resultset with single quotes still its not working like salry will be in resultset '1000','2000','3000','40000'
...
Use FIND_IN_SET()
SELECT A.id, A.title,
FROM (`table`) as A
WHERE A.active = '1'
AND FIND_IN_SET(A.id,(SELECT GROUP_CONCAT(B.id) from B where user = 3))
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