mysql - Finding unique emails across two tables -


i have 2 tables 1 each email address. want emails table a not in table b.

here query, seems hanging. must have missed something..

select c.field_23_4306 email, c.field_25_9341, c.field_26_1838, c.field_40_7355 form_7 c left join bounceback b on c.field_23_4306 = b.email c.field_23_4306 "%@%"

what did wrong? 

select a.mail not exists (select 1 b a.mail = b.mail)

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