[英]ORACLE GROUP BY with Date does not group correctly
I try to group a given table by date to get a min and max date of member IDs.我尝试按日期对给定的表进行分组以获得成员 ID 的最小和最大日期。 The result should display a time range from when to when a member was part of an OE.
结果应显示一个时间范围,从成员何时成为 OE 的一部分。
my given table (excerpt):我给定的表(摘录):
ID DATE OE
11 2021-03-06 00:00:00 2926
11 2021-03-07 00:00:00 3879
11 2021-03-08 00:00:00 3879
11 2021-03-09 00:00:00 3879
11 2021-03-10 00:00:00 2926
11 2021-03-11 00:00:00 2926
11 2021-03-12 00:00:00 2926
11 2021-03-13 00:00:00 2926
11 2021-03-14 00:00:00 2926
11 2021-03-15 00:00:00 2926
11 2021-03-16 00:00:00 1344
11 2021-03-17 00:00:00 1344
11 2021-03-18 00:00:00 1344
11 2021-03-19 00:00:00 1344
11 2021-03-20 00:00:00 1344
11 2021-03-21 00:00:00 1344
11 2021-03-22 00:00:00 2926
11 2021-03-23 00:00:00 2926
11 2021-03-24 00:00:00 2926
11 2021-03-25 00:00:00 2926
11 2021-03-26 00:00:00 2926
11 2021-03-27 00:00:00 2926
11 2021-03-28 00:00:00 2926
11 2021-03-29 00:00:00 2926
11 2021-03-30 00:00:00 2926
11 2021-03-31 00:00:00 2926
11 2021-04-01 00:00:00 1549
11 2021-04-02 00:00:00 1549
11 2021-04-03 00:00:00 1549
11 2021-04-04 00:00:00 2926
My Select:我的Select:
select id, min(date) as mind, max(date) as maxd,OE
from <table>
group by id,oe
order by mind desc;
The output should be something like this: output 应该是这样的:
ID | MIND | MAXD | OE
11 2021-04-04 00:00:00 2021-04-04 00:00:00 2926
11 2021-04-01 00:00:00 2021-04-03 00:00:00 1549
11 2021-03-22 00:00:00 2021-03-31 00:00:00 2926
11 2021-03-16 00:00:00 2021-03-21 00:00:00 1344
11 2021-03-10 00:00:00 2021-03-15 00:00:00 2926
11 2021-03-07 00:00:00 2021-03-09 00:00:00 3879
11 2021-03-06 00:00:00 2021-03-06 00:00:00 2926
But it is like this:但它是这样的:
ID | MIND | MAXD | OE
11 2021-04-01 00:00:00 2021-04-03 00:00:00 1549
11 2021-03-16 00:00:00 2021-03-21 00:00:00 1344
11 2021-03-07 00:00:00 2021-03-09 00:00:00 3879
11 2021-03-06 00:00:00 2021-04-04 00:00:00 2926
The result should display a time range from when to when a member was part of an OE.结果应显示一个时间范围,从成员何时成为 OE 的一部分。 Even if I add some other IDs (which I obviously have) it does not show the timeline of OE changes in correct order.
即使我添加了一些其他 ID(我显然有),它也不会以正确的顺序显示 OE 更改的时间线。
Any help highly appreciated!非常感谢任何帮助!
TIA, TIA,
Michael迈克尔
You can use a trick called tabibitosan
to do this kind of grouping:您可以使用一种称为
tabibitosan
的技巧来进行这种分组:
SELECT id,
MIN(dt) AS mind,
MAX(dt) AS maxd,
oe
FROM (SELECT id,
dt,
oe,
row_number() OVER (PARTITION BY ID ORDER BY dt) - row_number() OVER (PARTITION BY ID, oe ORDER BY dt) grp
FROM your_table)
GROUP BY id,
oe,
grp
ORDER BY mind DESC;
See this dbfiddle for results查看此 dbfiddle以获取结果
This works by assigning row numbers across the whole set of data (in this case, it's across each id), and then finding the row numbers across the subsets of data (ie across each id and oe), and then subtracting one from the other to form a number you can group by.这是通过在整个数据集中分配行号(在这种情况下,它是跨每个 id),然后找到跨数据子集的行号(即跨每个 id 和 oe),然后从另一个中减去一个来工作的形成一个可以分组的数字。 Consecutive rows get the same group number, but every time there's a non-consecutive row, the group number will change.
连续的行获得相同的组号,但每次出现不连续的行时,组号都会改变。
From Oracle 12, you can use MATCH_RECOGNIZE
for row-by-row pattern matching:从Oracle 12开始,可以使用
MATCH_RECOGNIZE
进行逐行模式匹配:
SELECT *
FROM table_name
MATCH_RECOGNIZE(
PARTITION BY id
ORDER BY "DATE"
MEASURES
FIRST(oe) AS oe,
FIRST("DATE") AS mind,
LAST("DATE") AS maxd
PATTERN (same_oe+)
DEFINE
same_oe AS oe = FIRST(oe)
)
Which, for the sample data:其中,对于示例数据:
CREATE TABLE table_name (ID, "DATE", OE) AS
SELECT 11, DATE '2021-03-06', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-07', 3879 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-08', 3879 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-09', 3879 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-10', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-11', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-12', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-13', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-14', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-15', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-16', 1344 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-17', 1344 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-18', 1344 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-19', 1344 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-20', 1344 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-21', 1344 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-22', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-23', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-24', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-25', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-26', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-27', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-28', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-29', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-30', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-03-31', 2926 FROM DUAL UNION ALL
SELECT 11, DATE '2021-04-01', 1549 FROM DUAL UNION ALL
SELECT 11, DATE '2021-04-02', 1549 FROM DUAL UNION ALL
SELECT 11, DATE '2021-04-03', 1549 FROM DUAL UNION ALL
SELECT 11, DATE '2021-04-04', 2926 FROM DUAL;
Outputs:输出:
ID ![]() |
OE![]() |
MIND![]() |
MAXD![]() |
---|---|---|---|
11 ![]() |
2926 ![]() |
2021-03-06 00:00:00 ![]() |
2021-03-06 00:00:00 ![]() |
11 ![]() |
3879 ![]() |
2021-03-07 00:00:00 ![]() |
2021-03-09 00:00:00 ![]() |
11 ![]() |
2926 ![]() |
2021-03-10 00:00:00 ![]() |
2021-03-15 00:00:00 ![]() |
11 ![]() |
1344 ![]() |
2021-03-16 00:00:00 ![]() |
2021-03-21 00:00:00 ![]() |
11 ![]() |
2926 ![]() |
2021-03-22 00:00:00 ![]() |
2021-03-31 00:00:00 ![]() |
11 ![]() |
1549 ![]() |
2021-04-01 00:00:00 ![]() |
2021-04-03 00:00:00 ![]() |
11 ![]() |
2926 ![]() |
2021-04-04 00:00:00 ![]() |
2021-04-04 00:00:00 ![]() |
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