Question

I have 3 tables Tag, Software and Software_Tag which make many-to-many relationship between two first.

I wish to split the subquery out on two parts (because i can not do in in one in mysql):


(SELECT softwares_id FROM Software_Tag GROUP BY softwares_id HAVING COUNT(*) >=2) as my

DELETE FROM Software_Tag WHERE tags_id=1 AND softwares_id IN (my)


Here i try use virtual table named ‘my’ to put it to second query.
How could i do it?

now it gets en exception like check your sql server.

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Answer 1

You could just do it as:

DELETE FROM Software_Tag WHERE tags_id=1 AND softwares_id IN
(SELECT softwares_id FROM Software_Tag GROUP BY softwares_id HAVING COUNT(*) >=2)

This should work in MySQL.

Edit .. try this

DELETE ST1
FROM Software_Tag ST1 
JOIN (SELECT softwares_id FROM Software_Tag GROUP BY softwares_id HAVING COUNT(*) >=2) ST2 on ST1.softwares_id=ST2.softwares_id
where ST1.tags_id=1