Question

这是合约。我有一张数据表。我需要根据某些字段填充行出现的字段。我可能有一排，我可能有10排。我需要填充这个数字。我一直在使用rownumber（）来确定数字是多少。但是更新表格一直存在问题。我已经尝试了连接，使用tablename as，然后选择，然后更新。没有任何效果。

此代码：

update Rptdata
SET c98 = (SELECT R from 
                (select rs1.c1, rs1.c5,rs1.c3, 
                row_number() over(partition by rs1.c1,0, rs1.c5,rs1.c3 order by rs1.c1,rs1.c5,rs1.c3 desc) as R
                from Rptdata rs1
                where rs1.c1 = c1
                and   rs1.c5 = c5
                and   rs1.c3 = c3
         --       and   rs1.c6 = c6
         --       and   rs1.c7 = c7
         --       and   rs1.c8 = c8
         --       and   rs1.c9 = c9
                and   rs1.program_name = 'INTERNAL'
                AND   rs1.program_id=030911 
                AND (rs1.c6  IS NULL
                or rs1.c8  IS NULL
                or rs1.c9  IS NULL)
                and rs1.c28 IS NULL 
               )
          )  
WHERE program_name = 'INTERNAL'
AND program_id=030911
AND (c6  IS NULL
or c8  IS NULL
or c9  IS NULL)
and c28 IS NULL

生成错误ORA-01427：单行子查询返回多行。我认为这就是我想要的。我取消评论 - 而rs1.c6 = c6 它告诉我我更新了187行（这是正确的）。我提交然后在那187行上运行一个选择，而c98中没有任何内容。

Answer 1

问题在于您需要将整个子查询作为一个单独的集处理，以便row_number为您提供所需的结果，但您还需要将该集合减少为单个记录为了更新每一行。虽然使用update可以实现这一点，但在这种情况下使用merge会更直接（假设您使用的是10g）：

MERGE INTO rptdata rp
USING      (SELECT ROW_NUMBER() OVER (PARTITION BY rs1.c1, 0, rs1.c5, rs1.c3 
                                      ORDER BY rs1.c1, rs1.c5, rs1.c3 DESC) AS r
            FROM   rptdata rs1
            WHERE  rs1.program_name = 'INTERNAL'
               AND rs1.program_id = 030911
               AND (rs1.c6 IS NULL OR rs1.c8 IS NULL OR rs1.c9 IS NULL)
               AND rs1.c28 IS NULL) rs
ON         (rs.c1 = rp.c1 AND rs.c5 = rp.c5 AND rs.c3 = rp.c3)
WHEN MATCHED THEN
   UPDATE SET
      c98   = rs.r
      WHERE      program_name = 'INTERNAL'
             AND program_id = 030911
             AND (c6 IS NULL OR c8 IS NULL OR c9 IS NULL)
             AND c28 IS NULL

顺便提一下，您提供的查询并不遥远。如上所述，您需要使用row_number获取整个集合，然后筛选每个要更新的行所需的单个记录。为此，您需要将连接条件移动到外部查询：

UPDATE rptdata
SET    c98   =
          (SELECT r
           FROM   (SELECT rs1.c1,
                          rs1.c5,
                          rs1.c3,
                          ROW_NUMBER() OVER (PARTITION BY rs1.c1, 0, rs1.c5, rs1.c3 
                                             ORDER BY rs1.c1, rs1.c5, rs1.c3 DESC)
                             AS r
                   FROM   rptdata rs1
                   WHERE  rs1.program_name = 'INTERNAL'
                      AND rs1.program_id = 030911
                      AND (rs1.c6 IS NULL OR rs1.c8 IS NULL OR rs1.c9 IS NULL)
                      AND rs1.c28 IS NULL)
           WHERE  rs1.c1 = c1 AND rs1.c5 = c5 AND rs1.c3 = c3)
WHERE  program_name = 'INTERNAL' 
   AND program_id = 030911 
   AND (c6 IS NULL OR c8 IS NULL OR c9 IS NULL) 
   AND c28 IS NULL

使用Oracle中的row_number（）更新多行

1 个答案: