select - SQL GROUP BY column from related table -


i have table t1

id     resolver   resolvedby 1               group1 2               group1 3               group1 4      b          group1 5      b          group1

i have table t2

groupid   group      person 1         group1           2         group1     b 3         group1     c

i made sql query return how many records resolved each person 

select resolver,count(*) t1 resolvedby='group1' group resolver

and returns correctly 

a 3 b 2

however retrieve statistics persons belong group user c have value 0. final result should be

a 3 b 2 c 0

based on edit:

you need outer join existing select 2nd table:

select t2.person, coalesce(cnt, 0) t2 left join  ( -- aggregate before join (usually more efficient)    select resolver,count(*) cnt    t1    resolvedby='group1'    group resolver  ) t1 on t1.resolver=t2.person t2."group"='group1' -- adding double quotes group keyword

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