Join between tables in two different databases?

Question

In MySQL, I have two different databases -- let's call them A and B.

Is it possible to perform a join between a table that is in database A, to a table that is in database B?

Answer 1

If the account has appropriate permissions, then you can use the below code.

Query:

SELECT <...>

FROM A.table1 t1 JOIN B.table2 t2 ON t2.column2 = t1.column1;

Note: you've got to prefix the table reference with the name of the DB it resides in.