MySQL Join Query to Sum a Field in One Table based on Its Corresponding Login ID in another Table -

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i have mysql table comment following fields:

loginid submissionid points

i have mysql table called submission following fields:

loginid submissionid

for given submissionid, loginid in 2 tables represent different things , therefore nor correspond.

i join sum points loginid. however, not loginid in comment, rather loginid in submission. connection between 2 tables made via submissionid

i can't work. below have far. i'm trying desired sum each loginid pulled another, third table, l.loginid represents.

how can this?

left join (     select c2.submissionid, c2.loginid sum(points) total      comment c2     inner join submission s2     on s2.submissionid = c2.submissionid     group c2.submissionid ) cscs on cscs.loginid = l.loginid 

select s2.loginid, sum(points) total  submission s2 inner join comment c2 on s2.submissionid = c2.submissionid group s2.loginid

this give points sum each loginid in submission table.


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