Calculate time difference from mutiple rows using SQL Server 2008 - sql

Question

I have 2 tables, 01 is current status and 01 is finish status.
I want to calculate time difference of 2 rows that have the same PO_NO,MANAGEMENT_NO,PROCESS_NAME .
Each PROCESS_NAME has the STATUS (Start/Finish)
ID INDEXNO PO_NO ITEM_CD MANAGEMENT_NO SEQ PROCESS_NAME STATUS Time_Occurrence TimeDiff (Minute)
43 126690 GV12762 332393961 616244 6 RFID Start 17-03-18 13:28 NULL
44 126690 GV12762 332393961 616244 6 RFID Finish 17-03-18 13:29 0
49 141646 GV14859 7E7060100 619005 2 Imprint Start 19-03-18 13:23 NULL
50 141646 GV14859 7E7060100 619005 2 Imprint Finish 19-03-18 13:30 7
48 141646 GV14859 7E7060100 619005 1 R.M.Requisition Start 19-03-18 13:18 NULL
56 141646 GV14859 7E7060100 619005 1 R.M.Requisition Finish 19-03-18 15:54 156
The expected result is : TimeDiff (Minute) column
select PO_NO, [MANAGEMENT_NO],[STATUS] [Time_Occurrence],
datediff(minute, (isnull((select [Time_Occurrence] from [TBL_FINISH_STATUS] t1 where t1.id=t2.id-1), dateadd(dd, 0, datediff(dd, 0, getdate())))), [Time_Occurrence])TimeDiff
from [PROC_MN].[dbo].[TBL_FINISH_STATUS] t2
ORDER BY PO_NO,MANAGEMENT_NO,ITEM_CD,Time_Occurrence
With above query, the result is far wrong with the expected result
Could anyone help me please?
Note: the ID column (48,56) of SEQ 1 of PO_NO: GV14859

Answer 1

If I understand what you want, then this seems like a simple query for it:
select INDEXNO, PO_NO, ITEM_CD, MANAGEMENT_NO, SEQ,
datediff(minute,
min(case when status = 'Start' then Time_Occurrence end),
max(case when status = 'Finish' then Time_Occurrence end)
) as timediff
from t
group by INDEXNO, PO_NO, ITEM_CD, MANAGEMENT_NO, SEQ;
Here is a SQL Fiddle.

Answer 2

It is not really clear what you are expecting as a result. Looking at your data sample, the design looks flawed from the start. There is too much redundancy for an SQL database. Maybe you don't have any control over the existing database. Anyway, this could be solved in N different ways and if my memory is not wrong, LEAD\LAG functions didn't exist in SQL server 2008 (but row_number is there as another solution). I tried to create something that is even compatible with older versions, but not sure if that is what you meant as a result:
DECLARE #myTable TABLE([ID] INT,
[INDEXNO] INT,
[PO_NO] VARCHAR(7),
[ITEM_CD] VARCHAR(10),
[MANAGEMENT_NO] INT,
[SEQ] INT,
[PROCESS_NAME] VARCHAR(15),
[STATUS] VARCHAR(6),
[Time_Occurrence] DATETIME,
[TimeDiff] VARCHAR(4));
INSERT INTO #myTable([ID], [INDEXNO], [PO_NO], [ITEM_CD], [MANAGEMENT_NO], [SEQ], [PROCESS_NAME], [STATUS], [Time_Occurrence], [TimeDiff])
VALUES(43, 126690, 'GV12762', '332393961', 616244, 6, 'RFID', 'Start', '20180317 13:28', NULL),
(44, 126690, 'GV12762', '332393961', 616244, 6, 'RFID', 'Finish', '20180317 13:29', '0'),
(49, 141646, 'GV14859', '7E7060100', 619005, 2, 'Imprint', 'Start', '20180319 13:23', NULL),
(50, 141646, 'GV14859', '7E7060100', 619005, 2, 'Imprint', 'Finish', '20180319 13:30', '7'),
(48, 141646, 'GV14859', '7E7060100', 619005, 1, 'R.M.Requisition', 'Start', '20180318 13:18', NULL),
(56, 141646, 'GV14859', '7E7060100', 619005, 1, 'R.M.Requisition', 'Finish', '20180318 15:54', '156');
SELECT * FROM #myTable;
WITH
Starters AS (
SELECT ID, PO_NO, [MANAGEMENT_NO], [PROCESS_NAME], [Time_Occurrence]
FROM #myTable
WHERE STATUS='Start'
),
Finishers AS (
SELECT ID, PO_NO, [MANAGEMENT_NO], [PROCESS_NAME], [Time_Occurrence]
FROM #myTable
WHERE STATUS='Finish'
)
SELECT s.PO_NO, s.MANAGEMENT_NO, s.PROCESS_NAME,
s.Time_Occurrence as [Start], f.Time_Occurrence as [End],
DATEDIFF(MINUTE, s.Time_Occurrence, f.Time_Occurrence) AS TIMEdiff
FROM Starters s
LEFT JOIN Finishers f ON s.PO_NO=f.PO_NO
AND s.MANAGEMENT_NO=f.MANAGEMENT_NO
AND f.PROCESS_NAME=s.PROCESS_NAME;