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Accepted
Giacomo Garabello
Asked: 2015-04-17 03:40:31 +0800 CST

Oracle 条件和

  • 772

看着这种代码，这个问题在我脑海中诞生：

select sum(value)
  into positive
  from my_table
 where value > 0;

 select sum(value)
  into negative
  from my_table
 where value < 0;

这适用于计算该表的总数。

但是，我的问题是如何my_table只使用一个语句来获得小计。

预期结果：

拥有这些数据my_table

VALUE
-----
  1.0
 -2.0
  3.0
 -4.0
  5.0
 -6.7
  8.9

我有一个 DML 语句可以给我这个输出

positive | negative
---------+---------
    17.9 |    -12.7

这种操作可行吗？如果是，我怎样才能得到它？

oracle dml

1 个回答

  1. Best Answer
    SQL> r
  1  with t as (
  2      select  1.0 as x from dual
  3      union all select -2.0 as x from dual
  4      union all select  3.0 as x from dual
  5      union all select -4.0 as x from dual
  6      union all select  5.0 as x from dual
  7      union all select -6.7 as x from dual
  8      union all select  8.9 as x from dual)
  9  select sum(case when x > 0 then x else 0 end) as sum_of_positives,
 10         sum(case when x < 0 then x else 0 end) as sum_of_negatives
 11*   from t

SUM_OF_POSITIVES SUM_OF_NEGATIVES
---------------- ----------------
            17,9            -12,7
    • 2

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