MySQL correlated subquery in JOIN syntax

Question

I would like to provide a WHERE condition on an inner query by specifying innertable.id = outertable.id. However, MySQL (5.0.45) reports \"Unknown column \'outertable.id\' i

Answer 1

My suggestion was going to be what you ruled out on the grounds of efficiency. E.g. leaving out the where clause and using a join (as per t.ticketid = a.ticketid)

Have you been able to prove your thoughts on inefficiency by some concrete examples? I know what you are saying but whatever method you use every row in the outer query is being joined to every row in the inner query so depending on the execution plan it may not be as inefficient as you suspect?