SQL 按别名分组

Question

我有一个用于表示时间的 smallint 列。我写了下面的代码来根据时间得出结果：

        CASE
    WHEN 
        CONVERT(varchar, t0.U_ORC_BE_ProdTime, 108) BETWEEN '07:00:00' AND '19:00:00' THEN '1'
    ELSE '2'
END  AS [Shift],
    --If time is between 7am and 7pm then Shift 1, else Shift 2

我想将它插入到我已有的查询中，然后让它也按班次分组。

    SELECT 

T6.U_ORC_BE_StyleName AS [Style Name],
T0.[ItemCode],
STUFF(T0.[ItemCode], 1, 6, '') AS [Shortened ItemCode],
SUM(T0.[PlannedQty]) AS [Planned Qty],
SUM(T0.CmpltQty) AS [Actual Qty], 
SUM(T0.CmpltQty) - SUM(T0.PlannedQty) AS [Qty Difference],
SUM(T5.U_ORC_BE_HECTOLITER * T0.CmpltQty) AS [Total Hectoliters],

CASE
    WHEN [.......]
    THEN
    WHEN [.......]
    THEN
END AS [Line],

T0.U_ORC_BE_ProdDate AS [Date Produced]

    FROM [.......]

    GROUP BY T6.U_ORC_BE_StyleName, T0.[ItemCode], T5.Code , T0.U_ORC_BE_ProdDate

它不断抛出一个错误，我怀疑这是由于试图按别名分组造成的。

"Each GROUP BY expression must contain at least one column that is not an outer reference."

Answer 1

要像 case 语句一样按计算列分组，您还必须在分组依据中包含该语句。例如：

SELECT
  CASE ... END AS CaseStatement,
  [YourColumns]
FROM YourTable
GROUP BY CASE ... END

Answer 2

如错误所述，您不能按别名分组。在分组依据之后，您将不得不复制整个案例。

 select 
 ....
 group by 
 T6.U_ORC_BE_StyleName, T0.[ItemCode], T5.Code , T0.U_ORC_BE_ProdDate,
 CASE
    WHEN [.......]
    THEN
    WHEN [.......]
    THEN
END

SQL 按别名分组

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sql-server-2016