结合两个单独的MySQL查询的结果

Question

我正在尝试做两个单独的数据库quires并将结果返回到表单.每个结果都写入一个表.

我希望能够将两个查询合并为一个,并按任务编号对结果进行排序.

第一个问题:

 //Booking  
    $Date= date("d/m/Y");
    $driver = $_SESSION['username'];
    $dbTaskRecords = "SELECT * FROM booking WHERE driver='$driver' AND Date= CAST('$Date_search' AS DATE) ORDER BY TaskNo ASC"; 
    $dbTaskRecords_result = mysql_query($dbTaskRecords);

第二个问题:

//Return Booking    
    $dbTaskReturn = "SELECT * FROM returnbooking WHERE driver='$driver' AND Date= CAST('$Date_search' AS DATE) ORDER BY TaskNo ASC";    
    $dbTaskReturn_result = mysql_query($dbTaskReturn);

然后通过while语句将结果输出到页面.

$i=0;
        while ($row = mysql_fetch_array($dbTaskRecords_result)){
        //Control Structure for Move Time on first Job of day           
        if ($i==0 ){
        $time = $row["Time"];
        //$time = 'N/A';

        }else{
            $time = 'N/A';
        }

        //Get Rego from trucks table        
        $truckID = $row["TruckID"];
        $Rego_select = mysql_query("SELECT VechicleRegistration FROM trucks WHERE TruckID = '$truckID'" )
        or die("Problem reading table: " . mysql_error());
        $Rego = mysql_result($Rego_select,0);

        //Get unregisted from trucks table
        $Unregisted_select = mysql_query("SELECT Unregistered FROM trucks WHERE TruckID = '$truckID'" )
        or die("Problem reading table: " . mysql_error());
        $Unregisted = mysql_result($Unregisted_select,0); 

        $id_note = $row["BookingID"];           


                echo    '<td><a href="taskpage.php?id='.$id_note.'"><button>'. $row['TaskNo']."</button><a/></td>";
                echo    "<td>". $time . "</td>";                           // Time Frame
                echo    "<td>". $Unregisted."</td>";                      // Pickup 
                echo    "<td>". $Rego."</td>";                           // Unregisted
                echo    "<td>".$row["PickupLocation"] . "</td>";        // Rego
                echo    "<td>".$row["DropOffLocation"] . "</td></tr>"; // Delivery
                $i=$i+1;//Control Set
                }
            echo'</tr>';

我为返回预订的结果重复相同的输出代码.

是否可以将两个查询组合成一个,以便两个表的结果集可以由ASC排序并由上述while语句输出.

Answer 1

这是要避免的众多原因之一Select *.你可以简单地使用一个联盟

Select Time, TruckId, TaskNo, PickupLocation, DropOffLocation
From booking 
Where driver='$driver' 
    And Date= CAST('$Date_search' AS DATE) 
Union All
Select Time, TruckId, TaskNo, PickupLocation, DropOffLocation
From returnbooking
WHERE driver='$driver' 
    And Date= CAST('$Date_search' AS DATE) 
Order By TaskNo Asc

在此解决方案中,您需要枚举列并确保列的类型,它们在两个Select子句中枚举的顺序是相同的.