SQL Snippet: Generate Row Numbers

June 8th, 2017 by

Microsoft SQL ServerIf you’ve been following this blog, you’ll know that I write a fair bit of SQL. I’m going to post some small snippets of SQL which I had to work out how to accomplish a small task as part of a larger script.

In thi spost, I am going to show how use ROW_NUMBER to generate a unique row number. There are three examples of code.

This first example, the simplest of the three, shows how to generate a unique number for each row in the recordset:

/*
Created by Ian Grieve of azurecurve|Ramblings of a Dynamics GP Consultant (http://www.azurecurve.co.uk)
This code is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.0 UK: England & Wales (CC BY-NC-SA 2.0 UK).
*/
SELECT
	PONUMBER
	,ORD
	,ITEMNMBR
	,ITEMDESC
	,ROW_NUMBER() OVER(ORDER BY PONUMBER, ORD ASC) AS CUSTOM_ROW_ID
FROM
	POP30110
GO

The second example, shows a row number can be assigned to the lines of each transaction (this is accomplished :

/*
Created by Ian Grieve of azurecurve|Ramblings of a Dynamics GP Consultant (http://www.azurecurve.co.uk)
This code is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.0 UK: England & Wales (CC BY-NC-SA 2.0 UK).
*/
SELECT
	PONUMBER
	,ORD
	,ITEMNMBR
	,ITEMDESC
	,ROW_NUMBER() OVER(PARTITION BY PONUMBER ORDER BY PONUMBER, ORD ASC) AS CUSTOM_ROW_ID
FROM
	POP30110
GO

This final example, takes the first example and shows how we can select a range of row numbers (this is useful if you are selecting data to display on a page):

/*
Created by Ian Grieve of azurecurve|Ramblings of a Dynamics GP Consultant (http://www.azurecurve.co.uk)
This code is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.0 UK: England & Wales (CC BY-NC-SA 2.0 UK).
*/
WITH POTRX AS
	(SELECT
		PONUMBER
		,ORD
		,ITEMNMBR
		,ITEMDESC
		,ROW_NUMBER() OVER(ORDER BY PONUMBER ORDER BY PONUMBER, ORD ASC) AS CUSTOM_ROW_ID
	FROM
		POP30110)
SELECT
	*
FROM
	POTRX
WHERE
	CUSTOM_ROW_ID BETWEEN 40 AND 59
GO

Read original post SQL Snippet: Generate Row Numbers at azurecurve|Ramblings of a Dynamics GP Consultant

Source: azurecurve

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