MySQL Cross-Database Joins: A Complete Guide

In MySQL, cross-database join queries can be accomplished by using the database name as a prefix. Here is an example:

SELECT t1.column1, t2.column2
FROM database1.table1 t1
JOIN database2.table2 t2 ON t1.column1 = t2.column1

In the example above, database1 and database2 are distinct databases, while table1 and table2 are tables within these databases. By using the database names as prefixes, we can reference different databases and tables in our queries, and use JOIN statements for table joins.