SQL

SQLServerCentral Article

SQL Window Functions Series: NTILE()

  • Article

Unlock the power of SQL's NTILE function with our latest deep-dive article. Learn to segment your data effectively into quantiles for more nuanced analysis, discover common pitfalls and their solutions, and optimize your queries for peak performance.

4.67 (3)

You rated this post out of 5. Change rating

2024-02-03 (first published: )

4,233 reads

SQLServerCentral Article

SQL Window Functions Series: LAG() and LEAD()

  • Article

Dive deep into the powerful SQL window functions, LAG() and LEAD(). Explore their intricacies, discover real-world examples, and avoid common pitfalls.

5 (3)

You rated this post out of 5. Change rating

2023-12-11

6,097 reads

SQLServerCentral Article

5 (4)

You rated this post out of 5. Change rating

2023-11-20 (first published: )

7,737 reads

External Article

Why a monitoring tool is an essential tool for growing server estates

  • Article

As we continue into the era of supporting more and more database platforms in our data estates, self-monitoring goes from being a very difficult task to a truly daunting task. I am personally advanced at diagnosing Microsoft SQL Server performance issues, but when that PostgreSQL server gets added, I just have to hope nothing goes wrong for a few years while I learn.

2023-04-10

Blogs

Counting Groups with Window Functions: #SQLNewBlogger

By

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

Extending a SQL Server Failover Cluster Across Regions in  Google Cloud Platform (GCP)

By

I was the principal author of this SIOS whitepaper, which describes how to build...

Read the latest Blogs

Forums

How to determine if a DB is currently being used

By dax.latchford

Hi - I'm looking for advice regarding the best & quickest way to establish...

Data cleansing/conversion tool HPE

By juliava

Hello.   I am looking for a tool Data cleansing/conversion, was recommended HPE any...

System views in a contained availability group

By mark4data

I have a query that runs in a job to check on orphaned users....

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