连接来自多个数据库的表使用

Question

I'd like to group together MariaDB tables with similar functionality into different databases. What is the preferred way of executing JOIN operation using PHP PDO on tables from multiple databases? Is there any performance penalty for doing that? Usually I only connect to 1 database at the time.

Is there some other way to organize mariadb tables? I am using Sequel Pro, and it is hard to work with when the number of tables increases to 50 or more with no visible separation between them.

Answer 1

I would personally suggest you to be careful with this especially If you wan't to achieve performance from your code. Carefully read documentation about JOIN what it does when you combining two tables, also suggesting you to read about indexing and unqiue keys in MariaDB. Good Luck:)