php - mysql IF conditioned by another field -


i have following simple inbox simulated query (for mail purposes)

select * inbox  receiver_id=:receiver_id  , receiver_type='a'  , spam!='y'  order date desc, time desc  limit :paging offset :offset

inbox table has regular fields such subject, mail_body, date, time etc. contains flag (sender_type) can "c", "l", "a" , (sender_id)

i want include extra field @ end of (select *) named ext contains extension of image particular type of user (so can display image - image format id, ext meaning $id . $ext - 1.jpg, 2.png etc....

i think doing 1 query better now, main query above, , each entry scan particular table type c, l , users, , requesting corresponding ext particular id (sender_id) can display picture.

would useful (and possible) add ext extension of image of each type of user in above select ? assume it's done if statement, don't know how. it's not simple thing.

i grab ext 3 different tables myl_u, mya_u , myc_c l, a , c type of users.

the l *a* , c tables queried like

select l_id, ext, name, .. myl_u select a_id, ext, name, .. myl_a select c_id, ext, name, .. myc_c

in inbox table, sender_id corresponds l_id, a_id , c_id

you can join tables on sender id , use ifnull method grab right ext.

select *        , ifnull(tl.ext, ifnull(ta.ext, tc.ext)) ext        , ifnull(tl.name, ifnull(ta.name, tc.name)) name inbox t1  left join myl_u tl on t1.sender_id=tl.l_id , t1.sender_type='l' left join mya_u ta on t1.sender_id=ta.a_id , t1.sender_type='a' left join myc_c tc on t1.sender_id=tc.c_id , t1.sender_type='c'  receiver_id=:receiver_id  , receiver_type='a'  , spam!='y'  order date desc, time desc  limit :paging offset :offset

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