Duplicate row based on other columns values - sql-server

Question

I am extracting orders from a table, each order has a status and a lead time.
An order passes from the status in the exact order as following:
'placed' > 'confirmed' > 'shipped'
The rows looks like
id_order dsc_status lead
1 placed 8
1 confirmed 5
1 shipped 1
I need to return:
id_order dsc_status lead iter
1 placed 8 0
1 placed 8 1
1 placed 8 2
1 placed 8 3
1 confirmed 5 0
1 confirmed 5 1
1 confirmed 5 2
1 confirmed 5 3
1 confirmed 5 4
1 shipped 1 0
1 shipped 1 1
Logic:
I the example the lead time difference between placed and confirmed is 3 so I repeat the placed row 4 times (0 based counting), same for confirmed > shipped.
For shipped we repeat as if followed by a fictive status having lead = 0 which means we repeat 2 times, please check the results.

Answer 1

You can use CURSOR to get your desired output-
DECLARE #id_order INT
DECLARE #id_Status_order INT
DECLARE #dsc_statue VARCHAR(100)
DECLARE #lead INT
DECLARE #LoopCount INT
DECLARE #TmpTable TABLE
(
id_order INT, dsc_status VARCHAR(200), lead INT, iter INT
)
DECLARE #id_order_prev INT
DECLARE #dsc_statue_prev VARCHAR(100)
DECLARE #lead_prev INT
DECLARE db_cursor CURSOR FOR
SELECT id_order,Status_Order,dsc_status,lead
FROM
(
SELECT id_order,dsc_status,lead,
CASE
WHEN dsc_status = 'placed' THEN 1
WHEN dsc_status = 'confirmed' THEN 2
WHEN dsc_status = 'shipped' THEN 3
END Status_Order
FROM your_table
)A
ORDER BY 1,2
OPEN db_cursor
FETCH NEXT FROM db_cursor INTO #id_order,#id_Status_order ,#dsc_statue,#lead
WHILE ##FETCH_STATUS = 0
BEGIN
IF #id_order_prev IS NULL
BEGIN
SET #id_order_prev = #id_order
SET #dsc_statue_prev = #dsc_statue
SET #lead_prev = #lead
END
ELSE
BEGIN
SET #LoopCount = 0
WHILE #LoopCount <= CASE WHEN #id_order_prev = #id_order THEN ABS(#lead_prev-#lead) ELSE #lead_prev END
BEGIN
INSERT INTO #TmpTable (id_order,dsc_status,lead,iter)
VALUES (#id_order_prev,#dsc_statue_prev,#lead_prev,#LoopCount)
SET #LoopCount = #LoopCount + 1
END
SET #id_order_prev = #id_order
SET #dsc_statue_prev = #dsc_statue
SET #lead_prev = #lead
END
FETCH NEXT FROM db_cursor INTO #id_order,#id_Status_order ,#dsc_statue,#lead
IF ##FETCH_STATUS <> 0
BEGIN
SET #LoopCount = 0
WHILE #LoopCount <= #lead
BEGIN
INSERT INTO #TmpTable (id_order,dsc_status,lead,iter)
VALUES (#id_order_prev,#dsc_statue_prev,#lead_prev,#LoopCount)
SET #LoopCount = #LoopCount + 1
END
END
END
CLOSE db_cursor
DEALLOCATE db_cursor
SELECT *
FROM #TmpTable
ORDER BY 1