Question

我有这个选择声明：

SELECT d.idcprefix,
         d.orgdept,
         d.idcseq,
         d.subcont, 
         d.actualcomp, 
         COUNT (*) AS "No Duplicates"
    FROM DCS_IDC, DCS_IDC z
   WHERE     D.IDCPREFIX = z.idcprefix
         AND z.orgdept = d.orgdept
         AND z.idcseq = d.idcseq
         and D.SUBCONT is not null
  HAVING COUNT (*) > 1
GROUP BY d.idcprefix,
         d.orgdept,
         d.idcseq,
         d.subcont,
         d.actualcomp
ORDER BY d.idcprefix,
         d.orgdept,
         d.idcseq,
         d.subcont,
         d.actualcomp

我希望删除从此语句中带回的行，任何想法？

删除FROM会给我一个ORA-01732: data manipulation operation not legal on this view错误，因为我相信，我正在比较两个表，尽管是同一个表。

我还尝试删除 tablename ，其中行存在，但删除的行数远远超过我想要的行数。

“重复”基于Subcont。使用subcont字段将数据/应用程序插入到数据库/应用程序中的记录是空白的，所以现在我的记录是相同的，除了一个例如，在子下的A中，而在另一个中它是空白的：

idcprefix, subcont, orgdept and idcseq
1          A        ABC         1
1                   ABC         1
2          A        BCD         1
2                   BCD         1

查询显示所有子记录中的子记录与没有子记录的子记录重复，我需要删除具有子记录值的子记录。

非常感谢帮助！

Answer 1

假设（idcprefix，subcont，orgdept，idcseq）是唯一的，下面怎么样？

DELETE FROM DCS_IDC
WHERE (idcprefix, subcont, orgdept, idcseq) IN (
  WITH del AS (
  SELECT d.idcprefix,
     d.orgdept,
     d.idcseq,
     d.subcont, 
     d.actualcomp, 
     COUNT (*) AS "No Duplicates"
  FROM DCS_IDC, DCS_IDC z
  WHERE     D.IDCPREFIX = z.idcprefix
     AND z.orgdept = d.orgdept
     AND z.idcseq = d.idcseq
     and D.SUBCONT is not null
  HAVING COUNT (*) > 1
  GROUP BY d.idcprefix,
     d.orgdept,
     d.idcseq,
     d.subcont,
     d.actualcomp
  ORDER BY d.idcprefix,
     d.orgdept,
     d.idcseq,
     d.subcont,
     d.actualcomp
  )
 SELECT idcprefix, subcont, orgdept, idcseq FROM del
)

Answer 2

怎么样：

BEGIN
  FOR aRow IN (SELECT d.idcprefix,
                      d.orgdept,
                      d.idcseq,
                      COUNT(*) AS DUP_COUNT
                 FROM DCS_IDC d
                 HAVING COUNT(*) > 1
                 GROUP BY d.idcprefix,
                          d.orgdept,
                          d.idcseq)
  LOOP
    DELETE FROM DCS_IDC
      WHERE IDCPREFIX = aRow.IDCPREFIX AND
            ORGDEPT = aRow.ORGDEPT AND
            IDCSEQ = aRow.IDCSEQ AND
            SUBCONT IS NOT NULL;
  END LOOP;
END;

无保证。使用风险由您自己承担。没有在动物身上测试过 - 你会成为第一个！

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删除从包含Oracle中的having和group by子句的Select语句返回的行

2 个答案: