使用LIKE在同一列上计算不同的值

Question

我有一个如下数据库

+------------+---------------------------------------+--------+
| sender     | subject                               | day    |
+------------+---------------------------------------+--------+
| Darshana   | Re: [Dev] [Platform] Build error      | Monday |
| Dushan A   | (MOLDOVADEVDEV-49) GREG Startup Error | Monday |
+------------+---------------------------------------+--------+

我想使用上表获得结果。它应该检查主题是否包含给定的单词，然后在给定日期的那个单词列中添加一个。

|Day      | "Dev"      | "startup"|
+---------+------------+----------+
| Monday  | 1          | 2        |
| Friday  | 0          | 3        |

我被认为使用了DECODE功能，但我无法获得预期的结果。

Answer 1

您可以使用条件聚合执行此操作：

select day, sum(subject like '%Dev%') as Dev,
       sum(subject like '%startup%') as startup
from table t
group by day;