Technical Article

Systems Thinking

J.D. Edwards was big on Systems Thinking, a way of looking at your systems and improving their functions. It was applied it to IT to become one of the top IT organizations to work for. Read some of these articles for an overview of how this works.

SQLServerCentral Article

Generic Data Comparison

Comparing two SQL Server tables to determine if the data is the same ought to be pretty simple. But then again, vendors like Red Gate Software sell tools to help you do it, so perhaps it isn't so simple. Author Leo Peysakhovich has to do this on a regular basis and none of the 3rd party products appear to work for him. Read his thoughts and samples on how he handles this at his job.

Blogs

Free webinar – Tackling the Gaps and Islands Problem with T-SQL Window Functions

By

I’m hosting a free webinar at MSSQLTips.com at the 19th of December 2024, 6PM...

Counting Groups with Window Functions: #SQLNewBlogger

By

I looked at row_number() in a previous post. Now I want to build on...

Read the latest Blogs

Forums

Find rows with very close time stamps

By daytonbrown2

Given the following table and query, this will return any records(based on message_id) that...

How to merge two tables with unlike fields

By landonh

How to merge two tables with unlike fields. I have two table with one...

Visual Studio 22 / SSIS Project / (Project) Connection problem

By WilburSmith

Hello, First of all, I find it odd/annoying that I can't exclude a Project...

Visit the forum

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