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category
cid  cname
1    a
2    b

products
pid  cid  pname  passed
1    1    a_A    0
2    1    a_B    1
3    1    a_C    1

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g_cid g_cname  g_pcount g_passed
1        a      3        2
2        b      0        0

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SQL code:
select a.*,isnull(b.cnt,0) as g_pcount,isnull(b.pas,0) as g_passed
from category a
left join
(select cid,count(1) as cnt,sum(passed) as pas from products group by cid) as b
on a.cid=b.cid



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