Applications that use the Jakarta Persistence API shouldn’t embed too much raw SQL in their code. However, when you need an SQL query for performance reasons or to access the database in a way that ...

To use a subquery introduced with an unmodified comparison operator, you must be familiar enough with your data and with the nature of the problem to know that the subquery will return exactly one ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

This step-by-step tutorial teaches how to successfully create and optimize a Performance Max for Travel Goals campaign.

The query from sql: joins with subquery to extract max are slow #23147 (comment) is faster, though still very slow (~10s). But it is also wrong, because it returns only one row (LIMIT 1), my goal was ...

Do you ever find yourself juggling queries to get the information you need? Subselects, also called subqueries, may be just what you’ve been looking for. This SQL feature allows you to query ...