查找3個或更多連續交易記錄，其中交易金額大於100且屬於同一類別的記錄

Question

我有一個客戶交易表，它有 3 列，id、Category、TranAmount。 現在我想找到 3 個或更多屬於同一類別且 TranAmount 大於 100 的連續交易記錄。以下是示例表：

Id    Category   TranAmount
 1           A          190
 2           A          160
 3           A          169  
 4           B          190
 5           A          90
 6           B          219
 7           B          492
 8           B          129
 9           B          390
 10          B          40
 11          A          110
 12          A          130

輸出應該是：

Id    Category   TranAmount
 1           A          190
 2           A          160
 3           A          169
 6           B          219
 7           B          492
 8           B          129
 9           B          390

Answer 1

查看“差距和孤島”參考以更深入地了解該方法。 這是您可以閱讀的眾多內容之一： https : //www.red-gate.com/simple-talk/sql/t-sql-programming/the-sql-of-gaps-and-islands-in-sequences/

在此特定問題中，您有兩個條件會導致連續系列中斷，即類別更改或金額不符合閾值。

with data as (
    select *,
        row_number() over (order by Id) as rn,
        row_number() over (partition by
            Category, case when TranAmount >= 100 then 1 else 0 end order by Id) as cn
    from Transactions
), grp as (
    select *, count(*) over (partition by rn - cn) as num
    from data
    where TranAmount >= 100
)
select * from grp where num >= 3;

https://rextester.com/DUM44618

Answer 2

我還不能真正對此進行測試，但請嘗試一下。

SELECT Id, Category, Amount FROM Table 
WHERE Amount > 100
and Category IN 
 (SELECT Category FROM Table
  WHERE Amount > 100
  GROUP BY Category HAVING COUNT (Category ) >= 3)

Answer 3

如果 id 之間沒有間隙，這將起作用：

select distinct t.* 
from tablename t inner join (
  select t.id from tablename t 
  where t.tranamount > 100
  and
  exists (
    select 1 from tablename
    where id = t.id - 1 and category = t.category and tranamount > 100
  )
  and
  exists (
    select 1 from tablename
    where id = t.id + 1 and category = t.category and tranamount > 100
  )
) tt on t.id in (tt.id - 1, tt.id, tt.id + 1)

請參閱演示。
結果：

Id | Category | TranAmount
-: | :------- | ---------:
 1 | A        |        190
 2 | A        |        160
 3 | A        |        169
 6 | B        |        219
 7 | B        |        492
 8 | B        |        129
 9 | B        |        390