与phpmyadmin相比，$ wpdb-＆gt; get_results查询返回不同（错误）的结果

Question

我的数据库中有4个自定义表格 - wp_api_teams，wp_api_matches，wp_api_competitions和wp_api_federations。它们是我的Wordpress数据库的一部分，这就是它们的外观（我正在使用外键和所有这些）：

我正在尝试输出属于联盟的所有团队。当我在phpmyadmin中运行它时，它可以工作：

SELECT
    wp_api_teams.team_id,
    wp_api_teams.title,
    wp_api_competitions.comp_id,
    wp_api_competitions.title,
    wp_api_federations.federation_id,
    wp_api_federations.title
FROM
    wp_api_teams
JOIN wp_api_matches
    ON wp_api_teams.team_id = wp_api_matches.hometeam_id OR wp_api_teams.team_id = wp_api_matches.awayteam_id
JOIN wp_api_competitions
    ON wp_api_matches.comp_id = wp_api_competitions.comp_id
JOIN wp_api_federations
    ON wp_api_competitions.federation_id = wp_api_federations.federation_id
WHERE wp_api_federations.federation_id = 1
GROUP BY (wp_api_teams.team_id);

我得到了我正在寻找的确切结果。

-----------------------------------------------------------------------------------
| team_id | title              | comp_id | title          | federation_id | title |
  1         Arsenal              1         Premier League   1               England
  2         Chelsea              1         Premier League   1               England
  3         Liverpool            1         Premier League   1               England
  4         Manchester United    1         Premier League   1               England
  5         Manchester City      1         Premier League   1               England

这是我在Wordpress中使用的代码：

global $wpdb;
$sql = "
SELECT
    wp_api_teams.team_id,
    wp_api_teams.title,
    wp_api_competitions.comp_id,
    wp_api_competitions.title,
    wp_api_federations.federation_id,
    wp_api_federations.title
FROM
    wp_api_teams
JOIN wp_api_matches
    ON wp_api_teams.team_id = wp_api_matches.hometeam_id OR wp_api_teams.team_id = wp_api_matches.awayteam_id
JOIN wp_api_competitions
    ON wp_api_matches.comp_id = wp_api_competitions.comp_id
JOIN wp_api_federations
    ON wp_api_competitions.federation_id = wp_api_federations.federation_id
WHERE wp_api_federations.federation_id = 1
GROUP BY wp_api_teams.team_id
";
$test = $wpdb->get_results($sql);
echo('<pre>');
print_r($test);
echo('</pre>');

我得到的结果是缺少两个表格列：

Array
(
    [0] => stdClass Object
        (
            [team_id] => 1
            [title] => England
            [comp_id] => 1
            [federation_id] => 1
        )
    [1] => stdClass Object
        (
            [team_id] => 2
            [title] => England
            [comp_id] => 1
            [federation_id] => 1
        )

....等等。

如您所见，结果中缺少wp_api_teams.title和wp_api_competitions.title列。

所以我的问题是，为什么会发生这种情况，为什么这些列被省略，我可以做些什么来解决这个问题，因为我在返回的结果中绝对需要它们。相同的查询如何在WP与PHPmyadmin中产生不同的结果。

这是一个已知错误还是我的代码有问题？

我在10.2.14-MariaDB上运行localhost，所有表格引擎都是InnoDB。

Answer 1

您的列名在结果集中是相同的。您需要提供别名：

global $wpdb;
$sql = "
SELECT
    wp_api_teams.team_id,
    wp_api_teams.title as team_title,
    wp_api_competitions.comp_id,
    wp_api_competitions.title as competition_title,
    wp_api_federations.federation_id,
    wp_api_federations.title as federation_title
FROM
    wp_api_teams
JOIN wp_api_matches
    ON wp_api_teams.team_id = wp_api_matches.hometeam_id OR wp_api_teams.team_id = wp_api_matches.awayteam_id
JOIN wp_api_competitions
    ON wp_api_matches.comp_id = wp_api_competitions.comp_id
JOIN wp_api_federations
    ON wp_api_competitions.federation_id = wp_api_federations.federation_id
WHERE wp_api_federations.federation_id = 1
GROUP BY wp_api_teams.team_id
";
$test = $wpdb->get_results($sql);
echo('<pre>');
print_r($test);
echo('</pre>');