how to give row number only for consecutive combination - sql

Question

I want to give row number only to the combination when it appears in a consecutive manner like ,
Please guide on how to get this type of sequence numbering in Tsql
I have tried with
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

Use ROW_NUMBER() with CTE. The query is based that when there are consecutive values, then different between ROW_NUMBER () OVER (ORDER BY REC_TS) and ROW_NUMBER () OVER (PARTITION BY Name, OrderType ORDER BY REC_TS) will remain same.
Something like this
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

Try this:
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