The code example from this page shows how to make a MySQL SELECT with JOIN table of different database, using PDO.
The trick is to specify both the database name and table in the SQL query, by using the syntax: database_name.table_name.
- This method works if you use an user and password for connecting to MySQL that has access to both databases.

Complete code example

// Data for connecting to MySQL
$mysql =['host'=>'localhost', 'dbname'=>'db_1', 'user'=>'root', 'pass'=>'password'];

//connects with PDO 
try {
  $conn = new PDO('mysql:host='. $mysql['host'] .'; dbname='. $mysql['dbname'], $mysql['user'], $mysql['pass']);
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); //set the PDO error mode to exception
}
catch(PDOException $e){ exit('Connection failed: '. $e->getMessage());}

$sql ="SELECT t1.id, t1.name, t2.col_db2 FROM db_1.table1 AS t1
 LEFT JOIN db_2.table2 AS t2 ON t1.id = t2.id";
$stmt = $conn->query($sql);

if($stmt !== false) {
  //shows selected data
  foreach($stmt as $row) {
    echo $row['id'] .'--'. $row['name'] .'--'. $row['col_db2'] .'<br>';
  }
}
else {
  echo '0 results';
}
- In this way you can join multiple tables from different databases.

Daily Test with Code Example

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PHP-MySQL
Which tag create a highlighted bolded text?
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<p>Address: <strong>http://CoursesWeb.net/</strong> - Tutorials.</p>
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text-size: 18px; font-style: italic; font-weight: 800;
#id {
  font-weight: 800;
}
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setInterval() setTimeout() push()
function someFunction() { alert("CoursesWeb.net"); }
setInterval("someFunction()", 2000);
Click on the correctly defined variable in PHP.
var vname = 8; $vname = 8; $vname == 8;
$vname = 8;
echo $vname;
Mysql SELECT JOIN tables on two different Databases

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