SQL

SQLServerCentral Article

How to filter non-existing records in SQL

  • Article

Introduction Developing predefined reports in addition to all the ad-hoc queries have been a part of my daily activities. Often I find my stakeholders asking me to prepare reports in which they want to know something that has never happened. It might sound strange, but yeah, that's what their point of concern is all about. […]

4.22 (9)

You rated this post out of 5. Change rating

2021-11-26 (first published: )

15,109 reads

SQLServerCentral Article

A User-Defined Function returns more rows

  • Article

The Problem Recently, while working with one of my clients, I came across a script in which I had to introduce a scalar User-Defined Function in the SELECT statement. The SELECT used to return around 750K records. However, after introducing the UDF, the row count significantly increased to 826K. There were no other changes made […]

4 (5)

You rated this post out of 5. Change rating

2019-10-14

5,037 reads

SQLServerCentral Article

Optimize Your SQL by Reformulating the Spec

  • Article

As SQL developers, we tend to think of performance tuning in terms of crafting the best table indices, avoiding scalar and table valued functions, and analyzing query plans (among other things). But sometimes going back to the spec and applying some properties of elementary math can be the best way to begin to improve performance of SQL queries which implement mathematical formulas. This article is a case study of how I used this technique to optimize my SQL implementation of the Inverse Simpson Index.

5 (3)

You rated this post out of 5. Change rating

2021-05-07 (first published: )

5,377 reads

Blogs

A Conversation That Refused to End: What We Learned from Our First Event in Zurich

By

On May 8, 2025, we hosted our first official event in Switzerland at Prime...

A DevOps Workshop Tomorrow in Atlanta

By

Tomorrow is the Redgate DevOps Day in Atlanta. You can still sign up, so...

Stop Wasting Time Rebuilding Indexes Every Night

By

Too many IT teams run index rebuild jobs on autopilot. Every night. Every index....

Read the latest Blogs

Forums

Question on SQL Query with NOT condition

By mcfarlandparkway

I have a record, in those the three columns where firstname / last name...

Execution Plan Operators

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Execution Plan Operators

Merge spans with Dates Logic

By dhanekulakalyan

--for a given member if the startdate and endate is continous we need to...

Visit the forum

Question of the Day

Execution Plan Operators

When looking at an execution plan in SSMS, what types of operators are shown?

See possible answers