MySQL的PHP​​的ID在一个表中，而不是另一个

Question

| Fixture_ID | League_ID | Home_Team | Away_Team 
|   1 |   1 |   1 |   2 
|   2 |   1 |   2 |   3 
|   3 |   1 |   3 |   1 

| Result_ID | Fixture_ID | Home_Goals | Away_Goals 
|   1 |   1 |   2 |   0 

| Team_ID | Team_Name | 
|  1 | Team A 
|  2 | Team B  
|  3 | Team C 

如何加入表只显示还没有结果inputed灯具，但输出的当显示灯具时（在下拉列表中），实际的球队名称（球队A v球队B）？

下面的代码适用于所有输出灯具：

echo '<td> <select name ="fixture_id">';  

// TRY TO SHOW FIXTURES WITH NO RESULTS 
$stmt = $pdo->prepare('SELECT f.*, t1.Team_Name AS Home, t2.Team_Name AS Away 
         FROM Fixture  f 
         INNER JOIN Team  t1 ON f.Home_Team = t1.Team_ID 
         INNER JOIN Team  t2 ON f.Away_Team = t2.Team_ID'); 


$stmt->execute(); 
foreach ($stmt as $row) { 
    echo '<option>' . $row['Home'] . ' v ' . $row['Away'] . '</option>'; 
} 

?> 

Answer 1

你的SQL应该是这样的：

SELECT f.*, t1.Team_Name AS Home, t2.Team_Name AS Away 
FROM Fixture  f 
INNER JOIN Team  t1 ON f.Home_Team = t1.Team_ID 
INNER JOIN Team  t2 ON f.Away_Team = t2.Team_ID 
LEFT JOIN Result r ON f.Fixture_ID = r.Fixture_ID 
WHERE r.id IS NULL;