我的SQL查询当前是:
SELECT ARINVT.CLASS,
ARINVT.ITEMNO,
ARINVT.DESCRIP,
ARINVT.ONHAND,
CASE
WHEN DAY_USE_TOTAL.CUM_MAT_QTY IS NULL THEN 0
ELSE SUM (DAY_USE_TOTAL.TOT_MAT_QTY) END "Material Usage"
FROM IQMS.ARINVT ARINVT
LEFT JOIN IQMS.DAY_USE_TOTAL DAY_USE_TOTAL
ON ARINVT.ID = DAY_USE_TOTAL.ARINVT_ID
WHERE CLASS = 'PL'
GROUP BY ARINVT.ID,
ARINVT.CLASS,
ARINVT.ITEMNO,
ARINVT.DESCRIP,
ARINVT.ONHAND
ORDER BY ARINVT.ITEMNO
我目前遇到错误ORA-00979: not a GROUP BY expression
。当我删除case语句并只有SUM()
:
SELECT ARINVT.CLASS,
ARINVT.ITEMNO,
ARINVT.DESCRIP,
ARINVT.ONHAND,
SUM (DAY_USE_TOTAL.TOT_MAT_QTY)
FROM IQMS.ARINVT ARINVT
LEFT JOIN IQMS.DAY_USE_TOTAL DAY_USE_TOTAL
ON ARINVT.ID = DAY_USE_TOTAL.ARINVT_ID
WHERE CLASS = 'PL'
GROUP BY ARINVT.ID,
ARINVT.CLASS,
ARINVT.ITEMNO,
ARINVT.DESCRIP,
ARINVT.ONHAND
ORDER BY ARINVT.ITEMNO
它工作得很好。为什么是这样?我认为这是因为该CASE
语句可以返回0,而该值不能与一起使用GROUP BY
,但是即使同时返回两个都似乎无法解决此问题。我该如何解决?我目前正在尝试使用子查询,但目前并没有太大的成功。
做这个:
SUM (CASE WHEN DAY_USE_TOTAL.CUM_MAT_QTY IS NULL THEN 0
ELSE DAY_USE_TOTAL.TOT_MAT_QTY END) "Material Usage"
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我来说两句