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SQLServerCentral Article

Sort of Unique

Recently Steve Jones noticed that someone wanted to use a UDF to enforce uniqueness. No big deal, right? Well this person wanted to enforce uniqueness based on some other column value. A bit of a challenge, but this article presents a couple ways to handle this.

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2002-08-12

4,256 reads

SQLServerCentral Article

Creating Stored Procedure Documentation with XML, SQL-DMO and XSLT

This article introduces TSQLDoc, a Windows Script Host script that extracts procedure metadata and embedded documentation comments from Transact-SQL stored procedures, generates XML documentation for every stored procedure in a database and optionally transforms the XML document into HTML or other format using XSLT.

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2002-08-09

15,900 reads

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Question of the Day

The LAGging NULL

I have this data in a SQL Server 2022 table:

player         yearid team HR
Alex Rodriguez 2012   NYY  18
Alex Rodriguez 2013   NYY  7
Alex Rodriguez 2014   NYY  NULL
Alex Rodriguez 2015   NYY  12
Alex Rodriguez 2016   NYY  9
If I run this code, what are the results returned in the hrgrowth column?
SELECT
  player
, yearid
, hr
, hr - LAG (hr, 1, 0) IGNORE NULLS OVER (ORDER BY yearid) AS hrgrowth
FROM dbo.playerstats;

See possible answers