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如何使用这2个连接来运行连接2个表的查询？yesno.table1和sushi.table1？让我们说我们加入id他们都有相同的ID.我怎样才能做到这一点？

// Connect to Yesno Database
$this->yesno_db = new mysqli("red", "yesno", "***", "yesnotmp");

if ($this->yesno_db->connect_errno) {
    throw new Exception('Connection failed: '.$this->yesno_db->connect_error);
}   

// Connect to Sushi Database
$this->sushi_db = new mysqli("red", "sushi", "***", "sushi");

if ($this->sushi_db->connect_errno) {
    throw new Exception('Connection failed: '.$this->sushi_db->connect_error);
}