Question

Hey guys I want to something like this:

DELETE FROM ClientsFlags 
WHERE clientId = (SELECT id 
                  FROM Client 
                  WHERE emailRegistrationToken = 3) 
AND flagId = 42;

But with a join rather than the sub query. I’m not very good with joins so please help me out.

Answer 1

here is a join version,

DELETE  a
FROM    ClientsFlags a
        INNER JOIN Client b
            ON a.clientId = b.id
WHERE   b.emailRegistrationToken = 3 AND            
        a.flagId = 42;