SQL join ON not equal in Mysql

Question

I have two tables. Both contains question id field. I want to get all records from first table that are not present in second one. I don\'t want to use \"NOT IN\" constrain as s

Answer 1

Try something like

SELECt  t1.*
FROM    Table1 t1 LEFT JOIN
        Table2 t2   ON  t1.questionID = t2.questionID
WHERE   t2.questionID IS NULL