简而言之,我试图按列分组,但前提是该列不是 null
或 0
,在这种情况下我仍然想获取这些行,但只是没有分组。我有这张表some_table
:
+--------+----------+---------------------+-------+
| id | other_id | date_value | value |
+--------+----------+---------------------+-------+
| 1 | abc | 2011-04-20 21:03:05 | 104 |
| 2 | abc | 2011-04-20 21:03:04 | 229 |
| 3 | xyz | 2011-04-20 21:03:03 | 130 |
| 4 | abc | 2011-04-20 21:02:09 | 97 |
| 5 | 0 | 2011-04-20 21:02:08 | 65 |
| 6 | xyz | 2011-04-20 21:02:07 | 101 |
| 7 | | 2011-04-20 21:02:07 | 200 |
| 8 | 0 | 2011-04-20 21:02:07 | 201 |
| 9 | | 2011-04-20 21:02:07 | 202 |
+--------+----------+---------------------+-------+
我想按 other_id
选择行和分组,还包括分组行的计数。此查询有效:
select id, other_id, date_value, value, cnt from
(
SELECT id, other_id, date_value, value,
ROW_NUMBER() OVER (partition by other_id order BY Date_Value desc) r,
count(*) OVER (partition by other_id) cnt
FROM some_table
)
where r = 1
结果是:
+--------+----------+---------------------+-------+-------+
| id | other_id | date_value | value | count |
+--------+----------+---------------------+-------+-------+
| 1 | abc | 2011-04-20 21:03:05 | 104 | 3 |
| 3 | xyz | 2011-04-20 21:03:03 | 130 | 2 |
| 5 | 0 | 2011-04-20 21:02:08 | 65 | 2 |
| 7 | | 2011-04-20 21:02:07 | 200 | 2 |
+--------+----------+---------------------+-------+-------+
问题是,我不想对 other_id
为 null
或 0
的行进行分组。所以想要的结果是这样的:
+--------+----------+---------------------+-------+-------+
| id | other_id | date_value | value | count |
+--------+----------+---------------------+-------+-------+
| 1 | abc | 2011-04-20 21:03:05 | 104 | 3 |
| 3 | xyz | 2011-04-20 21:03:03 | 130 | 2 |
| 5 | 0 | 2011-04-20 21:02:08 | 65 | 1 |
| 7 | | 2011-04-20 21:02:07 | 200 | 1 |
| 8 | 0 | 2011-04-20 21:02:07 | 201 | 1 |
| 9 | | 2011-04-20 21:02:07 | 202 | 1 |
+--------+----------+---------------------+-------+-------+
如您所见,所有内容都已分组,除非 other_id
为 null
或 0
,在这种情况下它们仍处于选中状态,但未分组.我还尝试按 date_value
订购。
我尝试在 OVER
子句中添加一个 WHERE
子句:
OVER (partition by other_id WHERE other_id IS NOT NULL AND other_id IS NOT '0' order BY Date_Value desc)
-- this produces an error: ORA-00907: missing right parenthesis
我考虑过执行第二个 select
查询并尝试将第一个结果堆叠在第二个结果之上,但我认为这不会起作用,因为顺序。
有什么方法可以根据条件进行这样的分组吗?
最佳答案
这样做就可以了:
SQL> select id, other_id, date_value, value, cnt from
2 (
3 SELECT id, other_id, date_value, value,
4 case
5 when other_id is null or other_id = '0' then 1
6 else ROW_NUMBER() OVER (partition by other_id order BY Date_Value desc)
7 end r,
8 case
9 when other_id is null or other_id = '0' then 1
10 else count(*) OVER (partition by other_id)
11 end cnt
12 FROM some_table
13 )
14 where r = 1
15 order by id;
ID OTH DATE_VALUE VALUE CNT
---------- --- ------------------- ---------- ----------
1 abc 2011-04-20 21:03:05 104 3
3 xyz 2011-04-20 21:03:03 130 2
5 0 2011-04-20 21:02:08 65 1
7 2011-04-20 21:02:07 200 1
8 0 2011-04-20 21:02:07 201 1
9 2011-04-20 21:02:07 202 1
6 rows selected.
SQL>
关于sql - Oracle SQL 按带计数的列分组,但仅当该列为空或 0 时,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14400235/