Mysqli join tables from 2 different databases

Question

How Can I use this 2 connections to run a query which joins 2 tables? yesno.table1 and sushi.table1 ? lets say we join by id they both have the same id. how can

Answer 1

This is possible but not in the way you're attempting it.

First, you will need to have a mysql user with permissions to access both databases.

Then you simply reference the secondary database as part of the query.

E.g.

// Connect to Database -- dbuser has permissions for database1 and database2
$this->db = new mysqli("localhost", "dbuser", "***", "database1");

$query = "SELECT t1.*, t2.* 
              FROM table_one AS t1
              INNER JOIN database2.table_two as t2 ON ( t1.id = t2.remote_id ) ";

This isn't possible if the databases are on two different servers.