Mastering Advanced SQL Functions For Efficient Queries

Introduction

SQL provides advanced functions like CASE, COALESCE, and NULLIF that are essential for handling conditional logic, null values, and value comparisons efficiently. These functions allow you to write more dynamic and robust queries for real-world applications. In this article, we’ll explore these powerful tools with practical examples.

  
  
  1. CASE: Conditional Logic in Queries

The CASE function allows you to perform conditional logic directly in SQL queries, similar to IF-THEN-ELSE in programming.
Syntax:

CASE
    WHEN condition1 THEN result1
    WHEN condition2 THEN result2...