Question

我需要帮助才能在此处提供最佳查询。我有以下数据库：

+----+--------------+-----------------+------------------------------+
| id | reference_id | reference_field |            value             |
+----+--------------+-----------------+------------------------------+
| 1  |     6215     |      title      |  Best recipe                 |
| 2  |     6215     |      introText  |  Intro for best recipe       |
| 3  |     6215     |      fullText   |  Full text for best recipe   |
| 4  |     6216     |      title      |  Play Football               |
| 5  |     6216     |      introText  |  Intro for play football     |  
| 6  |     6216     |      fullText   |  Full text for play football |
+----+--------------+-----------------+------------------------------+

我需要通过reference_id进行查询，我应该通过reference_field打印值，输出信息示例：

Best recipe
Intro for best recipe
Full text for best recipe

Play Football
Intro for play football 
Full text for play football

更新为此，我将使用PHP以下列方式打印查询：

$result = $config->mysqli->query("SELECT * FROM table_name ORBER BY reference_id");
while($row = $result->fetch_array()) {
    echo ('<h1>'.$row["title"].'</h1>');
    echo ('<h1>'.$row["introText"].'</h1>');
    echo ('<h1>'.$row["fullText"].'</h1>');
}

通过上面的查询，我逐个获取所有记录（未按reference_id分组），另一方面，如果我进行查询

SELECT * FROM table_name GROUP BY reference_id

如何在PHP中的循环交互中获取3个值（title，introText，fullText）？

正如您所看到的那样，正常的“order by”或“group by”不会产生正确的结果来打印循环上的值。我在这里看到的是，结果我应该通过PHP 中的每个循环交互打印 3条记录的值，而不是打印每条记录的3个字段，这有意义吗？

Answer 1

我认为这就是你所需要的：

SELECT value from TABLE_NAME
ORDER BY reference_id

Answer 2

你可能想要这个：

select *
from your_table
order by reference_id, reference_field desc;

Answer 3

创建连接，执行查询并显示结果：

<?php
$dbo = //Create db connection
$statement = $dbo->prepare("SELECT * FROM table_name ORBER BY reference_id");
$statement->execute();
$result = $statement->fetchAll(PDO::FETCH_ASSOC);

echo "<pre>";
print_r ($result);
echo "</pre>";

?>

Mysql查询按字段分组并打印分组字段

3 个答案: