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SQL Essentials: COALESCE Function Explained

edited Jul 25, 2025 2:54PM in Saved Searches

Overview

COALESCE is a function that returns the first non-null value from a list of arguments. In simpler terms, it helps you fill in missing or null values in your data with the first available value that is not null.

Let's say you have a customer database with contact details, and some entries have missing or outdated information. The COALESCE function can be used to provide a default or preferred value when the original data is missing.

Understanding the Syntax

The basic syntax for COALESCE is as follows:

COALESCE(value1, value2, ..., valueN)

Here, you provide a list of values (value1, value2, etc.) separated by commas. The function evaluates these values from left to right and returns the first one that is not null. If all values are null, it returns null.

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