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select convert(varchar(10),dt,120),
case when name='a' or name='b' then 'g1' when name='c' or name='d' then 'g2' else 'g3' end as g,
sum(col1) as col1,sum(col2) as col2,sum(col3) as col3
from tb
group by convert(varchar(10),dt,120),
case when name='a' or name='b' then 'g1' when name='c' or name='d' then 'g2' else 'g3' end