ORACLE GROUP BY with Date 分組不正確

Question

我嘗試按日期對給定的表進行分組以獲得成員 ID 的最小和最大日期。 結果應顯示一個時間范圍，從成員何時成為 OE 的一部分。

我給定的表（摘錄）：

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

我的Select：

    select id, min(date) as mind, max(date) as maxd,OE
    from <table>
    group by id,oe
    order by mind desc;

output 應該是這樣的：

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

但它是這樣的：

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

結果應顯示一個時間范圍，從成員何時成為 OE 的一部分。 即使我添加了一些其他 ID（我顯然有），它也不會以正確的順序顯示 OE 更改的時間線。

非常感謝任何幫助！

TIA，

邁克爾

Answer 1

您可以使用一種稱為tabibitosan的技巧來進行這種分組：

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;

查看此 dbfiddle以獲取結果

這是通過在整個數據集中分配行號（在這種情況下，它是跨每個 id），然后找到跨數據子集的行號（即跨每個 id 和 oe），然后從另一個中減去一個來工作的形成一個可以分組的數字。 連續的行獲得相同的組號，但每次出現不連續的行時，組號都會改變。

Answer 2

從Oracle 12開始，可以使用MATCH_RECOGNIZE進行逐行模式匹配：

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)
)

其中，對於示例數據：

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;

輸出：

ID	原始設備制造商	頭腦	最大
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

小提琴