Solved

update sequence field in Sql

Posted on 2013-06-26
4
428 Views
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
0
Comment
Question by:damixa
  • 3
4 Comments
 
LVL 65

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

Open in new window

0
 
LVL 65

Accepted Solution

by:
Jim Horn earned 500 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




 

Open in new window

0
 

Author Closing Comment

by:damixa
ID: 39278853
perfect, thanks
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 39279010
Thanks for the grade.  Good luck with your project.  -Jim
0

Featured Post

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
Ever wondered why sometimes your SQL Server is slow or unresponsive with connections spiking up but by the time you go in, all is well? The following article will show you how to install and configure a SQL job that will send you email alerts includ…
Viewers will learn how the fundamental information of how to create a table.
Viewers will learn how to use the UPDATE and DELETE statements to change or remove existing data from their tables. Make a table: Update a specific column given a specific row using the UPDATE statement: Remove a set of values using the DELETE s…

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now