Oracle上的条件SUM

法比奥·阿尔梅达(FábioAlmeida)

我正在尝试使用有条件的SUM进行查询。重置后,SUM需要大于15。像这样:

A | 3 | 3 
B | 7 | 10 
C | 6 | 16  -- ====
D | 5 | 5 
E | 9 | 14
F | 3 | 17  -- ====
G | 8 | 8

我该怎么做?

马修·麦克佩克(Matthew McPeak)

作为递归SQL的替代方法,您还可以使用SQLMODEL子句。就个人而言,尽管很难编写(因为像我一样的大多数人都需要查找语法),但我发现它比递归SQL易于阅读。

-- "test_data" is just a substitute for your real table, which I don't have
-- it is just so people without your table can run this example and would
-- not be part of your real solution.
with test_data ( sort_col, addend ) as
( SELECT 'A', 3 FROM DUAL UNION ALL
 SELECT 'B', 7 FROM DUAL UNION ALL
 SELECT 'C', 6 FROM DUAL UNION ALL
 SELECT 'D', 5 FROM DUAL UNION ALL
 SELECT 'E', 9 FROM DUAL UNION ALL
 SELECT 'F', 3 FROM DUAL UNION ALL
 SELECT 'G', 8 FROM DUAL ),
-- Solution begins here
sorted_inputs ( sort_col, sort_order, addend, running_sum_max_15) as
( SELECT sort_col, row_number() over ( order by sort_col ) sort_order, addend, 0 from test_data )
SELECT sort_col, addend, running_sum_max_15
from sorted_inputs
model 
dimension by (sort_order)
measures ( sort_col, addend, running_sum_max_15 )
rules update
( running_sum_max_15[1] = addend[1],
  running_sum_max_15[sort_order>1] = 
          case when running_sum_max_15[CV(sort_order)-1] < 15 THEN 
             running_sum_max_15[CV(sort_order)-1] ELSE 0 END+addend[CV(sort_order)]
)

结果

+----------+--------+--------------------+
| SORT_COL | ADDEND | RUNNING_SUM_MAX_15 |
+----------+--------+--------------------+
| A        |      3 |                  3 |
| B        |      7 |                 10 |
| C        |      6 |                 16 |
| D        |      5 |                  5 |
| E        |      9 |                 14 |
| F        |      3 |                 17 |
| G        |      8 |                  8 |
+----------+--------+--------------------+

本文收集自互联网,转载请注明来源。

如有侵权,请联系 [email protected] 删除。

编辑于
0

我来说两句

0 条评论
登录 后参与评论

相关文章

TOP 榜单

热门标签

归档