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declare @a varchar(10),@b varchar(10)
set @a='500.00'
set @b='30.0'
select cast(@a as decimal(18,2))* cast(@b as decimal(18,1))
select 时间,平均值,排放量 = cast(平均值 as decimal(18,2))*cast(累计流量 as decimal(18,2))
from test