Question

我想从3个不同的表中选择不同的列并在表数据中显示。

我有一个名为room的表。因为我有两个外键，分别称为Hotel_id和Room_Type_id。房间表中的其他列是价格，设施等。我想使用FK hotel_id从酒店表中获取hotel_name，并使用FK Room_Type_id从room_type表中获取room_type_name。

我脑筋急转弯，并使用联接分别查找hotel_name和room_type_name进行查询。使用以下查询

//Query to find hotel_name

$query = "SELECT hotels.hotel_name FROM hotels INNER JOIN room ON room.Hotel_Id=hotels.hotel_id";
$res = mysqli_query($connection, $query);
while ($data1 = mysqli_fetch_array($res)) {

//Query to find room_type_name:
 $sel_cus = "SELECT room_type.Room_Type_Name FROM room INNER JOIN room_type ON room.room_type=room_type.Room_Type_Id";
$res_cus = mysqli_query($connection, $sel_cus);
while ($data = mysqli_fetch_array($res_cus)) {

//Query to select price,and picture of room:
    $count=1; // counter to print serial numbers in table
$sel_cus = "select * from room Order by room_id ASC";
$res_cus = mysqli_query($connection, $sel_cus);
while ($row = mysqli_fetch_array($res_cus)) {

// here is code to print record in table

    <tbody>
            <tr>
            <td><?php echo $count;  ?></td>

            <td ><?php echo $data1['hotel_name'];?></td> 
                    <td><?php echo $data['Room_Type_Name']; ?></td>
                <td><?php echo $row['price']; ?></td>




  } // End Query to find hotel_name 


                                   } // End Query to find room_type_name:

} // end of Query to select price,and picture of room

上面的代码按照记录位于房间表中的方式迭代hotel_name和room_type_name，当前有2条记录位于房间表中，并且迭代2次，请帮助我解决此问题。

使用上述代码输出：

Sr      hotel_name         Roomtype   price      picture 
 1       ABC                Delux       600       a.jpg
 2       ABC                Delux       600       a.jpg
 3       XYZ                 Super      8000      bcv.jpg
 4       XYZ                Super       8000      bcv.jpg

I want the output like below
Sr      hotel_name         Roomtype   price      picture 
 1       ABC                Delux       600       a.jpg
 2      XYZ                 Super      8000       bcv.jpg

请帮助

Answer 1

您可以只使用一个查询，例如：

SELECT hotels.hotel_name 
    ,  room_type.Room_Type_Name
    , room.price 
    , room.facilities
    , room.picture 
FROM hotels 
INNER JOIN room ON room.Hotel_Id=hotels.hotel_id
INNER JOIN room_type ON room.room_type=room_type.Room_Type_Id
ORDER BY hotels.hotel_name ,  room_type.Room_Type_Name, room.price

如何使用带有3个不同表的while循环来回显数据库的特定列

1 个答案: