PHP / SQL - 多表搜索

Question

Hey guys i am looking for some way to search in multiple database table without using UNION. My code is pretty simple, its something like:

$con = new PDO( DB_HOST, DB_USER, DB_PASS ); 
    $con->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
    $sql1 = "SELECT * FROM evidence_vin WHERE vin = :vin LIMIT 1";
    $sql2 = "SELECT * FROM national_register_sk WHERE vin = :vin LIMIT 1";
    $sql = $sql1 . ' UNION ' . $sql2;

    $stmt = $con->prepare( $sql ) union ( $sql2 );
    $stmt->bindValue( "vin", $this->vin, PDO::PARAM_STR );
    $stmt->execute();
        echo "<table>";
        echo "<th>Progress</th>";
        echo "<th>Claim number</th>";
        echo "<th>Make</th>";
        echo "<th>Status</th>";
        echo "<th>View</th>";
        echo "<th>Action</th>";
        while ($row = $stmt->fetch()){
            echo "<tr>";
            echo "<td>24</td>";
            echo "<td>".$row['claim_number']."</td>";
            echo "<td>".$row['license']."</td>";
            echo "<td>".$row['country']."</td>";
            echo "<td>".$row['vin']."</td>";
            echo "<td><a href=\"detail.php?id=".$row["id"]."&action=detail\">detail</td>";
            echo "</tr>";
             } 
        }catch(PDOExeption $e){
        echo $e->getMessage();

I have some problems with this because i will need some specific data from table one and some specific from table 2 and i am not sure which one i will need yet. So i need some way to get a line from each table where VIN is $this->vin. (vin is in both tables same)

p.s. Tables dont have same number of colums

Answer 1

Have a look at JOINS: http://www.sitepoint.com/understanding-sql-joins-mysql-database/

If i understand your problem correctly that should solve it.