修改 Select 语句以求和单个字段

Question

我有下面的选择语句，它提取了我需要的所有数据，但我正在尝试修改它，以便对 PROD_DATE 的 SHIFT 的 REJECTS 求和。

SELECT B.PROD_DATE,B.SHIFT,B.REJECTS
FROM REJECTS B 
LEFT OUTER JOIN HIST_ILLUM_PART C ON B.HIST_ILLUM_PART_ID = C.ID
LEFT OUTER JOIN HIST_ILLUM_RT A ON A.ID = C.HIST_ILLUM_RT_ID
WHERE
B. REJECT_CODE NOT in ('START','SETUP','QC')
AND B.PROD_DATE >= SYSDATE - 8
ORDER BY SHIFT, PROD_DATE

我试过了

   SELECT B.PROD_DATE,B.SHIFT,SUM(B.REJECTS)

我收到以下错误：ORA-00937: not a single-group group function

我需要子查询吗？

Answer 1

在进行聚合时，将 GROUP BY 子句添加到您的查询中。在伪代码中，这意味着对于 B.PROD_DATE 和 B.SHIFT 的每个不同组，获取该集合的所有 B.REJECTS 的总和，

SELECT B.PROD_DATE,B.SHIFT,SUM(B.REJECTS) AS REJECTS
FROM REJECTS B 
LEFT OUTER JOIN HIST_ILLUM_PART C ON B.HIST_ILLUM_PART_ID = C.ID
LEFT OUTER JOIN HIST_ILLUM_RT A ON A.ID = C.HIST_ILLUM_RT_ID
WHERE
B. REJECT_CODE NOT in ('START','SETUP','QC')
AND B.PROD_DATE >= SYSDATE - 8
GROUP BY B.PROD_DATE,B.SHIFT
ORDER BY SHIFT, PROD_DATE