具有唯一值的MySQL回声组PHP

Question

如果有类似的问题，我很抱歉...我很难找到它们！我想要做的是在数据库中选择一些行，然后获取它们，但是根据唯一的行将它们分组回显。让我用一个例子解释（我省略了一些东西为简洁起见）：

我有这样的选择查询：

SELECT 
    e.exercisename ExerciseName, 
    eh.reps Reps, 
    eh.weight Weight 
FROM workouts w 
JOIN users u ON w.userid = u.id 
JOIN workouts_history wh ON w.id = wh.workoutid 
JOIN exercises e ON wh.exerciseid = e.id 
JOIN exercises_history eh ON wh.id = eh.workouts_historyid 

眼下，这给了我基于关闭此而表：

while($workoutrowridge = $workoutresultridge->fetch_assoc()) { 
    $workoutoutputridge .= '<tr>'; 
     $workoutoutputridge .= '<td>'.$workoutrowridge['ExerciseName'].'</td>'; 
     $workoutoutputridge .= '<td>'.$workoutrowridge['Reps'].'</td>'; 
     $workoutoutputridge .= '<td>'.$workoutrowridge['Weight'].'</td>';    
    $workoutoutputridge .= '</tr>'; 
} 

，看起来像这样：

Exercise | Reps | Weight 
--------------------------- 
Squats  | 8 | 135 
Squats  | 8 | 225 
Squats  | 6 | 315 
Squats  | 2 | 405 
Squats  | 1 | 485 
Bench (DB) | 8 | 60 
Bench (DB) | 6 | 80 
Bench (DB) | 4 | 90 
Bench (DB) | 2 | 95 
Pullup  | 4 | 0 
Pullup  | 3 | 25 
Pullup  | 1 | 45 
Pullup  | 1 | 70 

我想做些什么，虽然发生了，是为h为每个独特的“练习名称”（例如）附上新的表格。锻炼可能只有1运动，或者它可能有20个，并使用不同量的集每一个，就像这样：

Exercise | Reps | Weight 
--------------------------- 
Squats  | 8 | 135 
Squats  | 8 | 225 
Squats  | 6 | 315 
Squats  | 2 | 405 
Squats  | 1 | 485 

Exercise | Reps | Weight 
--------------------------- 
Bench (DB) | 8 | 60 
Bench (DB) | 6 | 80 
Bench (DB) | 4 | 90 
Bench (DB) | 2 | 95 

感觉好像是要保持这个作为一个查询的方式，只是在PHP中使用某种类型的foreach来做到这一点......但我一直无法得到这个。有什么建议么？

Answer 1

如果查询结果由ExerciseName排序我会做这样的

这是你的循环，我将只需要添加几行

的

$lastExercise = ""; // my edit 
while($workoutrowridge = $workoutresultridge->fetch_assoc()) { 
    if($workoutrowridge['ExerciseName'] != $lastExercise){ 
     $workoutoutputridge .= "<tr><td>Exercise</td><td>Reps</td><td>Weight</td></tr>"; 
    } 
    $lastExercise = $workoutrowridge['ExerciseName']; 

//the rest is your original code 
    $workoutoutputridge .= '<tr>'; 
     $workoutoutputridge .= '<td>'.$workoutrowridge['ExerciseName'].'</td>'; 
     $workoutoutputridge .= '<td>'.$workoutrowridge['Reps'].'</td>'; 
     $workoutoutputridge .= '<td>'.$workoutrowridge['Weight'].'</td>';    
    $workoutoutputridge .= '</tr>'; 
} 

Answer 2

你可以做这样的事情：

$currentExercise = ''; 
echo '<table>'; 
while($workoutrowridge = $workoutresultridge->fetch_assoc()) { 
    if($currentExercise !== '' && $workoutoutputridge['ExerciseName'] !== $currentExercise) { 
     echo '</table><table>'; 
    } 
    $workoutoutputridge .= '<tr>'; 
    $workoutoutputridge .= '<td>'.$workoutrowridge['ExerciseName'].'</td>'; 
    $workoutoutputridge .= '<td>'.$workoutrowridge['Reps'].'</td>'; 
    $workoutoutputridge .= '<td>'.$workoutrowridge['Weight'].'</td>'; 
    $workoutoutputridge .= '</tr>'; 

    $currentExercise = $workoutrowridge['ExerciseName']; 
} 
echo '</table>'; 

Answer 3

[编辑] 没有空<table>，如果你没有任何运动

---

对于一些干净的，你可以使用这个：

$currentEx = false; 

while($workoutrowridge = $workoutresultridge->fetch_assoc()) { 

    if(!$currentEx) // first round 
     $workoutoutputridge .= "<table>\n"; 
    else if($currentEx AND $workoutrowridge['ExerciseName'] != $currentEx){ 
     $workoutoutputridge .= "</table>\n"; 
     $workoutoutputridge .= "<table>\n"; 
     $currentEx = $workoutrowridge['ExerciseName']; 
    } 

    $workoutoutputridge .= "<tr>\n"; 
    $workoutoutputridge .=  "<td>".$workoutrowridge['ExerciseName']."</td>\n"; 
    $workoutoutputridge .=  "<td>".$workoutrowridge['Reps']."</td>\n"; 
    $workoutoutputridge .=  "<td>".$workoutrowridge['Weight']."</td>\n";   
    $workoutoutputridge .= "</tr>\n"; 

} 

if($workoutoutputridge) 
    $workoutoutputridge .= "</table>\n";