The COALESCE SQL query allows us to perform operations on NULL values. Here’s what it is, how it works, and why you need to pay attention to it.

Introduction

The SQL language is a beauty. It is a beauty not only because it’s the language we talk to many relational databases like MySQL, SQL Server, and PostgreSQL, but also because it has many caveats unique to itself. The COALESCE SQL query is one of those caveats.

What is the COALESCE SQL Query and When to Use It?

In simple words, this SQL query is a part of an SQL statement that returns the first value in a list that is not NULL. In other words, this SQL query would return “BreachDirectory.com” because it is the first non-null value in an array:

SELECT COALESCE(NULL, NULL, NULL, NULL, NULL, 'BreachDirectory.com', NULL, NULL, 'BreachDirectory');

Results of a Completed COALESCE SQL Statement

The COALESCE SQL clause is just that – it isn’t a “tool” or a client of any sort: the SQL clause allows us to return the first item in an array of values that is not NULL. We use such a clause in a SQL query once we have an array of values and have a use case that necessitates the first non-NULL value to be retrieved, displayed, or otherwise acted on.

FAQ

What Does This SQL Query Do?

This SQL query allows us to return the first value in an array of values that is not NULL.

When to Use the COALESCE SQL Query?

Consider using the COALESCE SQL query when you have a use case that necessitates acting on an array of values and returning a value that isn’t NULL.

Nirium

Recent Posts

Important Google Play Store Update: Google to Verify Developers to Block Malware in Apps

Developers of Android apps will soon need to verify their identity as a result of…

1 week ago

Millions of McDonald’s Job Applications Exposed: The Hidden Risk Behind the McDonald’s Breakfast Menu

A fan of the McDonald’s breakfast menu? Bad news - over 60 million job applications…

1 week ago

T Mobile Customers to Receive Data Breach Settlement Checks

In 2021, hackers had allegedly accessed sensitive personal information pertaining to over 53 million customers…

1 week ago

Is Your Seagate External Hard Drive Real? A Hard Drive Fraud Ring Uncovered in Malaysia

Seagate has uncovered a Seagate external hard drive and internal hard drive fraud ring in…

1 week ago

Hackers Are Using AI for Phishing and Spear Phishing Campaigns

Hackers are using generative AI for phishing and spear phishing campaigns. Learn more here!

1 week ago

Signed Up for a VPN Free Trial? Your Privacy May be in Danger

A Chrome VPN extension may pose a danger to your privacy. A VPN free trial…

1 week ago