update w
set w.TagCount=x.TagCount
from (select ItemID,COUNT(*) as TagCount from r where IsValid=1 group by ItemID) as x
where ID =4 and IsValid=1 and w.ID=x.ItemID
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update w
set w.TagCount=x.TagCount
from (select ItemID,COUNT(*) as TagCount from r where IsValid=1 group by ItemID) as x
where ID =4 and IsValid=1 and w.ID=x.ItemID
相关文章：