Question

This mysql query gives me unknown column error

SELECT count(vs.no) AS no_of_vocabs, level, owner_no FROM vocab_stats as vs 
LEFT JOIN (SELECT no, level FROM mst_words) mw ON mw.no = vs.vocab_no 
WHERE owner_no = 6 AND correct > 0 AND vs.no_of_vocabs > 50 
group by owner_no, level

How can I fix this?

Answer 1

You should use HAVING (see documentation on SELECT)

SELECT COUNT(vs.no), level, owner_no FROM vocab_stats as vs 
LEFT JOIN (SELECT no, level FROM mst_words) mw ON mw.no = vs.vocab_no 
WHERE owner_no = 6 AND correct > 0
GROUP BY owner_no, level
HAVING COUNT(vs.no) > 50