SQL服務器計算字符串值

Question

Declare @table table 
(
    Col1 varchar(50), 
    Col2 varchar(50) 
) 

insert into @table 
    select '100', '*10+2' 

select Col1 + '' + Col2 
from @table 

預期成果是：1002

能否請你幫忙嗎？

Answer 1

使用這樣的：

Declare @table table 
(
Col1 varchar(50), 
Col2 varchar(50) 
) 
Declare @Out varchar(100),@Query varchar(100)='' 

insert into @table 
select '100', '*10+2' 

select @Out= Col1 + '' + Col2 
from @table 
SET @Query = 'SELECT ' +@Out 
EXEC (@Query) 

Answer 2

Use EXEC SQL query : 

Declare @table table 
(
    Col1 varchar(50), 
    Col2 varchar(50) 
) 
DECLARE @Cal VARCHAR(100) 

insert into @table 
select '100' , '*10+2' 

SELECT @Cal = Col1+''+Col2 from @table 
SELECT @Cal = 'SELECT (' + @Cal + ')' 
EXEC (@Cal)