What are some best practices for writing SQL queries?

What are some best practices for writing SQL queries?

Some best practices include using meaningful table and column names, avoiding SELECT *, and using JOINs instead of subqueries when possible.

Why should I avoid using SELECT *?

Using SELECT * can lead to performance issues, as it retrieves all columns, even those you don't need, which can slow down your query.

What about indexing? How does it help?

Indexing improves query performance by allowing the database to find rows faster, but it should be used judiciously to avoid overhead.

Can you give me an example of a good JOIN?

Sure! A good JOIN example is using INNER JOIN to combine data from two tables based on a related column, like customer ID.