select MobileType, COUNT(*) as CNT
, Convert(DECIMAL(5, 0), COUNT(*)* 100.0/sum(count(*)) over () ) as Rate
from BannerClick
group by MobileType
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select MobileType, COUNT(*) as CNT
, Convert(DECIMAL(5, 0), COUNT(*)* 100.0/sum(count(*)) over () ) as Rate
from BannerClick
group by MobileType