Invalid query: Out of sort memory, consider increasing server sort buffer size
select
group_concat(tags.id separator ',') as tags_ids,
faq.*
from tags_x_faq
left outer join faq on faq.id = tags_x_faq.id_faq
left outer join tags on tags.id = tags_x_faq.id_tag
where online like 'Yes'
and id_faq in (
select id_faq from tags_x_faq WHERE id_tag=31
)
group by faq.id