Question

我有这个查询，

SELECT      
   ORDUNIQ , 
   SUM(UNITPRICE * ORIGQTY) AS 'LineTotal', 
   SUM(TAMOUNT1 + TAMOUNT2 + TAMOUNT3 + TAMOUNT4 + TAMOUNT5) AS 'TotalTax',
   CAST('LineTotal' as numeric(9,2)) as [lTotal],
   CAST('TotalTax' as numeric(9,2)) as [tTax],
   SUM('lTotal' + 'tTax') AS 'OverallTotal'
FROM OEORDD
Group BY ORDUNIQ

我正在尝试将'LineTotal'和'TotalTax'加在一起但是我收到以下错误

操作数数据类型varchar对sum运算符
无效

有谁能告诉我如何正确实现这一目标？

谢谢

贾斯汀

Answer 1

; WITH taxCTE
AS 
(
SELECT
    ORDUNIQ
    , SUM(UNITPRICE * ORIGQTY) AS 'LineTotal'
    , SUM(TAMOUNT1 + TAMOUNT2 + TAMOUNT3 + TAMOUNT4 + TAMOUNT5) AS 'TotalTax'
FROM
    OEORDD
GROUP BY
    ORDUNIQ
)

SELECT
    CAST(LineTotal AS NUMERIC(9, 2)) AS [lTotal]
  , CAST(TotalTax AS NUMERIC(9, 2)) AS [tTax]
  , SUM(CAST(LineTotal AS NUMERIC(9, 2)) + CAST(TotalTax AS NUMERIC(9, 2))) AS 'OverallTotal'
FROM
    taxCTE ;

您无法像在原始查询中那样引用别名列。而是使用子查询，或者如上面的CTE。

Answer 2

您无法在定义的同一级别引用列别名。因为您使用单引号分隔对象标识符，所以假设您正在尝试对字符串文字求和。

您可以将查询放入CTE以重用列别名和select。

;WITH T AS
(
SELECT      ORDUNIQ , 
            SUM(UNITPRICE * ORIGQTY) AS LineTotal, 
            SUM(TAMOUNT1 + TAMOUNT2 + TAMOUNT3 + TAMOUNT4 + TAMOUNT5) AS TotalTax
FROM         OEORDD
Group BY ORDUNIQ
)
SELECT *,
        LineTotal + TotalTax AS OverallTotal
FROM T

Answer 3

操作数数据类型varchar对sum运算符无效，这意味着您无法将varchar添加到整数。在sum语句中，所有列都应该是integer类型，none应该是varchar类型。所以我会检查你已经为初学者添加到sum语句中的每个列类型。

SQL Server SUM来自其他SUM的两个值

3 个答案: