Question

我有一个像这样的选择结果：

 ID  |  Amount    
---------------
 xx1 |  105
 xx2 |  70

如果金额大于50，我想将行拆分为多行，结果是：

 ID  |  Amount
---------------
 xx1 |  50
 xx1 |  50
 xx1 |  5
 xx2 |  50
 xx2 |  20

Answer 1

递归解决方案：

WITH t(id, amount) AS
  (SELECT id, amount
   FROM mytable
   UNION ALL
   SELECT id, amount - 50
   FROM t
   WHERE amount - 50 > 0)
SELECT id
      ,least(amount, 50) amount
FROM t
ORDER BY id
        ,least(amount, 50) DESC

遵循Frank Schmitt的评论。一个MODEL解决方案应该在Oracle 10g中运行：

SELECT id
     , least(amt, 50) amount
FROM
  (SELECT id
        , amt
   FROM mytable t
   MODEL
     PARTITION BY (id)
     DIMENSION BY (0 d)
     MEASURES (amount amt)
     RULES ITERATE (1024) UNTIL (amt[ITERATION_NUMBER] < 50)
       ( amt[ITERATION_NUMBER+1] = amt[ITERATION_NUMBER] - 50 ))
WHERE amt > 0
ORDER BY id
       , amt DESC

您应确保1024 * 50＆gt; = max（金额），或更改要执行的最大迭代次数。

Oracle sql根据列中的最大值拆分行

1 个答案: