DECLARE @TotalRunBalance decimal
查询
SELECT SUM (RunBalance) AS WhatShows from Activity_Table where Engine#=1
获得的答案:2.49
查询
SET @TotalRunBalance = (SELECT SUM(RunBalance) from Activity_Table where Engine#=1)
SELECT @TotalRunBalance AS WhatShows2
显示的答案:2
任何人都知道为什么我输了0.49吗? -当我使用@TotalRunBalance变量时,它破坏了接下来的计算
答案 0 :(得分:0)
您必须添加精度DECIMAL(m,a)
Example
declare @TotalRunBalance decimal(18,3)
set @TotalRunBalance=2.49
select @TotalRunBalance
您在下面的情况
DECLARE @TotalRunBalance decimal(18,3) // add precision in decimal declaratiton
Query
SELECT SUM (RunBalance) AS WhatShows from Activity_Table where Engine#=1
Answer obtained: 2.49
Query
SET @TotalRunBalance = (SELECT SUM(RunBalance) from Activity_Table where Engine#=1)
SELECT @TotalRunBalance AS WhatShows2