CASE Statement error with ORA-00979: not a GROUP BY expression

Question

我正在努力解决为什么下面注释掉的代码 (

AND ESIB.UNIT_OF_ISSUE IS NULL

) 会出现错误 -

ORA-00979: not a GROUP BY expression

当我在

CASE

语句中取消注释这个附加条件时。

UNIT_OF_ISSUE

和

PRIMARY_UOM_CODE

都是String类型的字段。如果我只使用

WHEN ESIB.PRIMARY_UOM_CODE = 'EA'

就可以了，所以我不明白为什么

AND...

条件会导致问题。

我知道我可以将整个 case 表达式添加到 GROUP BY，但我想看看这里是否还有其他选项，以及为什么会这样。

SELECT ESIB.ITEM_NUMBER, 
       ESIT.LONG_DESCRIPTION, 
       IOP.ORGANIZATION_CODE, 
       isub.secondary_inventory SUBINVENTORY_CODE, 
       CASE WHEN SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY) IS NULL 
       THEN  0         
       WHEN ESIB.PRIMARY_UOM_CODE = 'EA' --AND ESIB.UNIT_OF_ISSUE IS NULL
       THEN SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY)          
       ELSE SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY) / INTRACONV.CONVERSION_RATE  
       END ONHAND_QTY
      ,ESIB.PRIMARY_UOM_CODE ONHAND_UOM
FROM   EGP_SYSTEM_ITEMS_B ESIB
       INNER JOIN EGP_SYSTEM_ITEMS_TL ESIT
       ON ESIB.INVENTORY_ITEM_ID = ESIT.INVENTORY_ITEM_ID 
          AND ESIB.ORGANIZATION_ID = ESIT.ORGANIZATION_ID 
       INNER JOIN INV_ORG_PARAMETERS IOP
       ON ESIB.ORGANIZATION_ID = IOP.ORGANIZATION_ID
          AND INVENTORY_FLAG = 'Y' 
          AND isub.organization_id = iop.organization_id 
GROUP BY
       ESIB.ITEM_NUMBER, 
       ESIT.LONG_DESCRIPTION, 
       IOP.ORGANIZATION_CODE, 
       isub.secondary_inventory, 
       ESIB.PRIMARY_UOM_CODE,
        INTRACONV.CONVERSION_RATE 

Answer 1

INTRACONV.CONVERSION_RATE

不在

GROUP BY

子句中：

一些选项是：

1. 在

   INTRACONV.CONVERSION_RATE

   子句中添加

   GROUP BY

   。

2. 将

   INTRACONV.CONVERSION_RATE

   部门移动到

   SUM

   聚合：

   CASE
   WHEN SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY) IS NULL 
   THEN 0         
   WHEN ESIB.PRIMARY_UOM_CODE = 'EA'
   --AND ESIB.UNIT_OF_ISSUE IS NULL
   THEN SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY)          
   ELSE SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY / INTRACONV.CONVERSION_RATE)
   END AS ONHAND_QTY
   

3. 将

   INTRACONV.CONVERSION_RATE

   包裹在不同的聚合函数中（例如

   MAX

   、

   MIN

   、

   AVG

   等）：

   CASE
   WHEN SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY) IS NULL 
   THEN 0         
   WHEN ESIB.PRIMARY_UOM_CODE = 'EA'
   --AND ESIB.UNIT_OF_ISSUE IS NULL
   THEN SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY)          
   ELSE SUM(IOQD.PRIMARY_TRANSACTION_QUANTITY)
         / MAX(INTRACONV.CONVERSION_RATE)
   END AS ONHAND_QTY