SQL Subqueries vs. CTEs: Which One Should You Use?

Subqueries and CTEs are two powerful tools for writing complex SQL queries. They allow you to filter data, perform calculations, and join tables in ways that would be difficult or impossible using a single SQL statement.

When to Use Subqueries and CTEs

Subqueries are a good choice for simple nested queries, such as filtering data based on a value returned from another query. They can also be used to perform complex calculations.

CTEs are a better choice for complex queries, where the nested query is difficult to read or write, or where the nested query is referenced multiple times in the main query. CTEs can also be used to break down complex queries into smaller, more manageable pieces.

In a nutshell, Subqueries and CTEs are your friends when working with databases. Use subqueries for precise data filtering, and rely on CTEs when dealing with complex structures or recursive data. Incorporating these techniques into your SQL toolkit will help you create cleaner, more efficient, and easily understandable code.

Happy querying!