To intuitively understand join operations, we first build a simple example database that stores grocery items and their corresponding categories. The category information is stored in the categories ...

Especially in the second edition, it has been fully updated for MySQL 8, and after reading it, you will feel that this is not just a book; it is more like a practical manual that helps you truly ...

I'm doing a package tracking feature for the website of a delivery service out here. I'm trying to perform an inner join based on the success of an if statement in my sql query.

I've been struggling for quite a while trying to understand what I'm doing wrong, but I can't get it.<BR><BR>I have three tables:<BR>"Users" which contain "id" and "name"<BR>"Calendar" which contains ...