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update sequence field in Sql

Posted on 2013-06-26
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Last Modified: 2013-06-26
So i have a table with lets say four fields on table1

Date
Group
Status
Sequence_number

i need to update the sequence grouping the fields by the other three fields.

so if there are 4 records where Date, Group and Status are the same,  the Sequence_number would start at 101, 102, 103, 104 then start again at 101 for the next group of records where these three fields are the same.

thanks in advance
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Question by:damixa
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4 Comments
 
LVL 66

Expert Comment

by:Jim Horn
ID: 39278044
Here's the SELECT, with some supporting testing code.  Copy-paste this into your SSMS, verify it works, then we'll have to figure out how to UPDATE with the final set.

CREATE TABLE #tmp (date datetime, the_group varchar(10), status varchar(10), sequence_number int) 

INSERT INTO #tmp (date, the_group, status)
VALUES 
	('1-1-2012', 'Group1', 'Ready'), 
	('1-1-2012', 'Group1', 'Ready'), 
	('1-1-2012', 'Group1', 'Ready'), 
	('1-1-2012', 'Group1', 'Not Ready'), 	
	('1-1-2012', 'Group2', 'Ready'), 
	('1-1-2012', 'Group2', 'Not Ready'), 
	('1-1-2012', 'Group2', 'Not Ready'), 
	('7-1-2012', 'Group1', 'Ready'), 
	('7-1-2012', 'Group1', 'Ready'), 
	('7-1-2012', 'Group1', 'Ready'), 
	('7-1-2012', 'Group1', 'Not Ready'), 	
	('7-1-2012', 'Group2', 'Ready'), 
	('7-1-2012', 'Group2', 'Not Ready'), 
	('7-1-2012', 'Group2', 'Not Ready')
	
SELECT * FROM #tmp

SELECT date, the_group, status, sequence_number = ROW_NUMBER() OVER (PARTITION BY date, the_group, status ORDER BY date ) + 100
FROM #tmp
ORDER BY date, the_group, status

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LVL 66

Accepted Solution

by:
Jim Horn earned 2000 total points
ID: 39278106
If there's a PK on your table, then this works...

DROP TABLE #tmp

CREATE TABLE #tmp (id int identity(1,1), date datetime, the_group varchar(10), status varchar(10), sequence_number int) 

INSERT INTO #tmp (date, the_group, status)
VALUES 
	('1-1-2012', 'Group1', 'Ready'), 
	('1-1-2012', 'Group1', 'Ready'), 
	('1-1-2012', 'Group1', 'Ready'), 
	('1-1-2012', 'Group1', 'Not Ready'), 	
	('1-1-2012', 'Group2', 'Ready'), 
	('1-1-2012', 'Group2', 'Not Ready'), 
	('1-1-2012', 'Group2', 'Not Ready'), 
	('7-1-2012', 'Group1', 'Ready'), 
	('7-1-2012', 'Group1', 'Ready'), 
	('7-1-2012', 'Group1', 'Ready'), 
	('7-1-2012', 'Group1', 'Not Ready'), 	
	('7-1-2012', 'Group2', 'Ready'), 
	('7-1-2012', 'Group2', 'Not Ready'), 
	('7-1-2012', 'Group2', 'Not Ready')
	
SELECT * FROM #tmp ORDER BY id

UPDATE #tmp
SET sequence_number = rn.seq
FROM #tmp
  JOIN (
	SELECT id, ROW_NUMBER() OVER (PARTITION BY date, the_group, status ORDER BY date ) + 100 as seq
	FROM #tmp) rn ON #tmp.id = rn.id

SELECT * FROM #tmp ORDER BY id




 

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Author Closing Comment

by:damixa
ID: 39278853
perfect, thanks
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LVL 66

Expert Comment

by:Jim Horn
ID: 39279010
Thanks for the grade.  Good luck with your project.  -Jim
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