在 SQL Server 中执行列值 [英] Execute column values in SQL Server

问题描述

我需要对保存在 SQL 表中的值进行算术运算，例如，我在下一列中的值为 5*10 我想要 15

I need to do an arithmetic operation to the values saved in SQL table, for example, I have value as 5*10 in next column I want 15

EQUATION    VALUE
2+5          7
6+8          14

根据我需要计算的等式.

Based on the equation I need to calculate the value.

推荐答案

正如您现在所知，SQL Server 没有 EVAL() 函数.但是，使用一点动态 SQL，这是可能的，但真的不推荐.

As you know by now, SQL Server does not have an EVAL() function. However, with a little dynamic SQL, it is possible, but really not recommended.

示例

Declare @YourTable Table (id int,[EQUATION] varchar(150))
Insert Into @YourTable Values 
 (1,'2+5')
,(2,'6+8')
,(3,'datediff(DAY,''2018-01-01'',getdate())')  -- Added Just for Fun


Declare @SQL varchar(max) = Stuff((Select ',' + concat('(',ID,',',[EQUATION],')')
                                     From @YourTable  A
                                     For XML Path (''))
                                 ,1,1,'')
Exec('Select * from (values ' + @SQL + ')A([ID],[Value])')

退货

ID  Value
1   7
2   14
3   189

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