SQL Performance Quick Guide
In this guide, you'll learn 14 different tactics on how you can improve the performance of your SQL queries, such as:
- removing DISTINCT and finding the real problem
- Using EXISTS instead of IN
- Changing UNION to CASE and simplifying your query
- Changing correlated subqueries to joins
And many more!
Each tactic includes an explanation, a sample SQL query that shows how to apply the concept, and links to articles/videos/documentation for more details.
The techniques provided can be applied to Oracle, SQL Server, MySQL, and Postgres.
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Donna M, Database Star customer
Your explanations are so clear and concise that you donβt need to go on and on and on as I have heard others do.