如何轉動查詢在MySQL

Question

我見下表：

Year, Name, Revenue, Qty 

我想結果表

名稱，Revenue2012，Qty2012，Revenue2013，Qty2013

如何在Sql for MySql中完成？

感謝

Answer 1

MySQL不具有旋轉功能，但你可以使用聚合函數CASE表達式得到的結果：

select name, 
    sum(case when year = 2012 then revenue else 0 end) revenue2012, 
    sum(case when year = 2012 then qty else 0 end) qty2012, 
    sum(case when year = 2013 then revenue else 0 end) revenue2013, 
    sum(case when year = 2013 then qty else 0 end) qty2013 
from yourtable 
group by name 

Answer 2

如果你正在使用PHP但是，您可以顯示它你想要：

$table=mysqli_query($con," 
SELECT * 
FROM table 
"); 

echo "<table> 
<tr> 
<th>Name</th> 
<th>Revenue2012</th> 
<th>Qty2012</th> 
<th>Revenue2013</th> 
<th>Qty2013</th> 
</tr>"; 

while($row = mysqli_fetch_array($table)) 
    { 
    echo "<tr>"; 
    echo "<td>". $row['Name'] . "</td>"; 
    echo "<td>". $row['Revenue'] . $row['Year'] . "</td>"; 
    echo "<td>". $row['Qty '] . "</td>"; 
    echo "<td>". $row['Revenue'] . $row['Year'] . "</td>"; 
    echo "<td>". $row['Qty '] . "</td>"; 
    echo "</tr>"; 
    } 
echo "</table>"; 

或任何適合您的需求。