SQL query optimization is a big topic. Each technique or problem needs a separate article to cover the bases. But when you’re just starting to level up your game with queries, you need something simpler to rely on. This is the goal of this article.

You might say your queries are optimal, everything performs well, and users are happy. Of course, performance isn’t everything. The results should also be correct. Whether it’s a join, a subquery, a synonym, a CTE, a view, or whatever, it must perform acceptably.

And at the end of the day, you can go home with your users. You don’t want to stay in the office fixing the slow-running queries overnight.

Before we begin, let me assure you that the journey won’t be rough. This will just be a primer. We’ll have examples that won’t be too alien to you too. Finally, when you are ready for a deeper study, we’ll present some links you can check out.

Let’s begin.

#sql server #query optimization #sql query #sql