noname :
I want to find all ids of which group_concat only contains 'a'. Here is simplified table from mine.
╔════╦══════════════╦
║ id ║ group_concat ║
╠════╬══════════════╬
║ 1 ║ a,b,b ║
║ 2 ║ a ║
║ 3 ║ a,a ║
║ 4 ║ a,a,a ║
║ 5 ║ a,b,a ║
╚════╩══════════════╩
And the table below is what I want to achieve.
╔════╦══════════════╦
║ id ║ group_concat ║
╠════╬══════════════╬
║ 2 ║ a ║
║ 3 ║ a,a ║
║ 4 ║ a,a,a ║
╚════╩══════════════╩
And this is the query statement I am trying to use.
select id, group_concat(val)
from user
group by id
having group_concat(val) = 'a'
Thanks in advance
Joel Coehoorn :
Try this:
select id, group_concat(val)
from user
group by id
having count(distinct val) = 1 and max(val) = 'a'
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