在sqlserver中使用抽取

我编写了一个sql查询和示例查询，如下所示：

select 
    value1,
    value2,
    value3,
    (
        select CAST(amount1 as decimal(17,2)) from 
        table1 where something...) 
       - select CAST(amount2 as decimal(17,2)) from table1 where something...)
    ) as 'Total Purchase'

    from 
        table1
    where 
        something

但是，我在-运算符处遇到语法错误

我尝试使用下面的Set语句

Declare 
   @value1 decimal(17,2),
   @value2 decimal(17,2),
   @result decimal(17,2)

set value1 = select CAST(amount1 as decimal(17,2)) from table1 where something...);
set value2 = select CAST(amount2 as decimal(17,2)) from table1 where something...);
set result = value1 - value2;

但我又犯了语法错误

我可以用什么来代替-operator

---

谢谢你的建议，

只是一个语法错误，我相信应该是这样的：

( 
(select CAST(amount1 as decimal(17,2)) from table1 where something...) - (select CAST(amount2 as decimal(17,2)) from table1 where something...)
) as total purchase

---

只是语法错误，我相信应该是这样的：

( 
(select CAST(amount1 as decimal(17,2)) from table1 where something...) - (select CAST(amount2 as decimal(17,2)) from table1 where something...)
) as total purchase

---

如果我理解正确，您发布的查询可以简化为以下内容

select 
    value1,
    value2,
    value3,
    CAST(amount1 as decimal(17,2)) - CAST(amount2 as decimal(17,2)) as 'Purchase'
    from 
        table1
    where 
        something

或者尝试使用外部查询执行相同的操作，如

select value1, value2,value3, (amt1 - amt2) as 'Total Purchase'
from
( 
select 
    value1,
    value2,
    value3,
    CAST(amount1 as decimal(17,2)) as amt1,
    CAST(amount2 as decimal(17,2)) as amt2
    from 
        table1
    where 
        something
 ) tab

---

如果我理解正确，您发布的查询可以简化为以下内容

select 
    value1,
    value2,
    value3,
    CAST(amount1 as decimal(17,2)) - CAST(amount2 as decimal(17,2)) as 'Purchase'
    from 
        table1
    where 
        something

或者尝试使用外部查询执行相同的操作，如

select value1, value2,value3, (amt1 - amt2) as 'Total Purchase'
from
( 
select 
    value1,
    value2,
    value3,
    CAST(amount1 as decimal(17,2)) as amt1,
    CAST(amount2 as decimal(17,2)) as amt2
    from 
        table1
    where 
        something
 ) tab

---

sql中有很多错误。试试这个

SELECT value1,
       value2,
       value3,
       (SELECT Cast(amount1 AS DECIMAL(17, 2))
        FROM   table1 where something...) - (SELECT Cast(amount2 AS DECIMAL(17, 2))
                          FROM   table1 where something...) AS 'Total Purchase'
FROM   table1

或

---

sql中有很多错误。试试这个

SELECT value1,
       value2,
       value3,
       (SELECT Cast(amount1 AS DECIMAL(17, 2))
        FROM   table1 where something...) - (SELECT Cast(amount2 AS DECIMAL(17, 2))
                          FROM   table1 where something...) AS 'Total Purchase'
FROM   table1

或

---

在“某物…”的情况下，在所有的地方都是相等的

 select 
        value1,
        value2,
        value3,
        (
            select (CAST(amount1 as decimal(17,2))  -  CAST(amount2 as decimal(17,2)) )
        ) as 'Total Purchase'

        from 
            table1
        where 
            something

---

在“某物…”的情况下，在所有的地方都是相等的

 select 
        value1,
        value2,
        value3,
        (
            select (CAST(amount1 as decimal(17,2))  -  CAST(amount2 as decimal(17,2)) )
        ) as 'Total Purchase'

        from 
            table1
        where 
            something

---

在某物中添加一个…-选择前选择右键代码尝试从数字中减去表格。为什么选择第二个？你想干什么？查找两行之间的金额差异？something是非常重要的，因为您可以通过自连接获得这两个数量。或者您正在尝试从同一行减去两列值？@Mahmut EFE您的子选择只需要返回一行，因此您可以使用SELECT SUAMOUNT1..-选择SUMamount2…在某物中添加一个…-选择前选择右键代码尝试从数字中减去表格。为什么选择第二个？你想干什么？查找两行之间的金额差异？something是非常重要的，因为您可以通过自连接获得这两个数量。或者您正在尝试从同一行减去两列值？@Mahmut EFE您的子选择只需要返回一行，因此您可以使用SELECT SUAMOUNT1..-选择SUMamount2…感谢您的回复。但它不起作用。我也犯了同样的错误。@MahmutEFE你想做什么？这段代码毫无意义，像WHERE子句这样的重要部分在您的回复中丢失了存储库。但它不起作用。我也犯了同样的错误。@MahmutEFE你想做什么？这段代码毫无意义，像WHERE子句这样的重要部分丢失了