Question

(Main table id equal to jid. Join based on that.)
The 1st item has got 2 row in the join table. /That’s great./
But 3rd item has got no row in join table.
The question: How can i ignore those items that has got no joined rows? IN ONE QUERY.

I tried the following:

SELECT *
FROM mainTable AS mainT
LEFT JOIN joinTable AS joinT ON mainT.id=joinT.jid
WHERE COUNT(joinT.id) > 0

Answer 1

Replace LEFT JOIN with INNER JOIN, and remove the WHERE clause.