Question

我想在连续出现时只给组合行号，比如请指导如何在Tsql中获得这种类型的序列编号

我试过

ROW_NUMBER() Over (Partition by name,Order_type Order by REC_TS)
where record REC_TS is the time of order.



 Name:  Order type:     Seq Number:

    AAA     ONLINE  1

    AAA     ONLINE  2

    AAA     STORE   1

    AAA     SPOT    1

    AAA     STORE   1

    AAA     SPOT    1

    AAA     SPOT    2

    AAA    ONLINE   1

Answer 1

将ROW_NUMBER()与CTE一起使用。该查询基于当存在连续值时，ROW_NUMBER () OVER (ORDER BY REC_TS)和ROW_NUMBER () OVER (PARTITION BY Name, OrderType ORDER BY REC_TS)之间的差异将保持不变。

像这样的东西

DECLARE @Table1 TABLE
(
    Name VARCHAR(10),
    OrderType VARCHAR(10),
    REC_TS DATETIME
)

Insert into @Table1
SELECT 'AAA','ONLINE','2014-09-01'
UNION ALL SELECT 'AAA','ONLINE','2014-09-02'
UNION ALL  SELECT 'AAA','STORE','2014-09-03' 
UNION ALL SELECT  'AAA','SPOT','2014-09-04'
UNION ALL SELECT  'AAA','STORE','2014-09-05'
UNION ALL SELECT  'AAA','SPOT','2014-09-06'
UNION ALL SELECT  'AAA','SPOT','2014-09-07'
UNION ALL SELECT  'AAA','ONLINE','2014-09-07'


;WITH CTE
AS (SELECT *, 
ROW_NUMBER () OVER (ORDER BY REC_TS) - ROW_NUMBER () OVER (PARTITION BY Name, 
            OrderType
            ORDER BY REC_TS) AS RowGroup
FROM @Table1) 
SELECT ROW_NUMBER () OVER (PARTITION BY RowGroup, 
        Name, 
        OrderType
        ORDER BY REC_TS) AS Sequence, 
Name,OrderType
FROM CTE
ORDER BY REC_TS;

Answer 2

试试这个：

CREATE TABLE Orders 
(
    Name VARCHAR(10),
    OrderType VARCHAR(10),
    REC_TS DATETIME
)

Insert into Orders
VALUES 
  ('AAA','ONLINE','2014-09-01'),
  ('AAA','ONLINE','2014-09-02'),
  ('AAA','STORE','2014-09-03'), 
  ('AAA','SPOT','2014-09-04'),
  ('AAA','STORE','2014-09-05'),
  ('AAA','SPOT','2014-09-06'),
  ('AAA','SPOT','2014-09-07'),
  ('AAA','ONLINE','2014-09-07')

;WITH OrdersRN
AS
(
    SELECT [Name], OrderType, ROW_NUMBER() OVER (ORDER BY [REC_TS]) AS RN, [REC_TS]
    FROM Orders 
),
OrdersRecurs 
AS
(
    SELECT O1.Name, O1.OrderType, 1 As Seq, O1.RN
    FROM OrdersRN O1
    WHERE RN = 1

    UNION ALL
    SELECT O1.Name, O1.OrderType, 
        CASE
            WHEN Prev.Name IS NULL THEN 1 
            WHEN Prev.Name = O1.Name AND Prev.OrderType = O1.OrderType THEN Prev.Seq + 1
            ELSE 1
        END As Seq, 
        O1.RN
    FROM OrdersRN O1
    INNER JOIN OrdersRecurs Prev
        ON Prev.RN = O1.RN - 1
    WHERE O1.RN <> 1

)
SELECT O.[Name], O.OrderType, O.[Seq]
FROM OrdersRecurs O

如何仅为连续组合提供行号

2 个答案: