Question

大家我在SQL SERVER中有这个查询

declare @nivel AS INT

set @nivel =3

SELECT * FROM TABLE1 AS A inner join TABLE2 as B ON A.COL1 = b.COL + @NIVEL

我想要连接一个变量 A.COL1 = b.COL3
没有转换''STRING

中的所有查询

Answer 1

试试这个

select * 
  from Table1 a
       join Table2 b on a.Col1=case @nivel
                                   when 1 then b.Col1
                                   when 2 then b.Col2
                                   when 3 then b.Col3
                                   ...
                                 end

然而，这是非常糟糕的设计。您应该考虑重新设计Table2以包含类似

的内容

| ColNo | ColumnData
|   1   | Data of column 1
|   2   | Data of column 2
|   3   | Data of column 3

然后您的查询会更直接

select * 
  from Table1 a
       join Table2 b
         on a.Col1 = b.ColumnData 
        and b.ColNo = @nivel

Answer 2

尝试：

declare @nivel AS INT

set @nivel =3

SELECT * FROM TABLE1 AS A 
inner join TABLE2 as B ON A.COL1 = b.COL + CAST(@NIVEL AS CHAR)

将字符串与实际表SQL SERVER连接

2 个答案: