Question

您好朋友我有问题。我的身份是＆＃39; 28＆＃39;我想只显示这个id的位置，它有第一个对象。我该如何制作这种类型的SQL？

WP sql：

$rows = $wpdb->get_results( 
        "SELECT hotels.id,hotels.hotel,reviews.hotel_id,reviews.id 
        FROM hotels 
        INNER JOIN reviews ON hotels.id = reviews.hotel_id" );
        var_dump($rows);

的var_dump

 array (size=4)
      0 => 
        object(stdClass)[710]
          public 'id' => string '28' (length=2)
          public 'hotel' => string 'xxxxx' (length=14)
          public 'hotel_id' => string '17' (length=2)
      1 => 
        object(stdClass)[709]
          public 'id' => string '29' (length=2)
          public 'hotel' => string 'xxxxxx' (length=14)
          public 'hotel_id' => string '17' (length=2)

Answer 1

使用WHERE子句

SELECT hotels.hotel,reviews.hotel_id,reviews.id 
FROM hotels 
INNER JOIN reviews ON hotels.id = reviews.hotel_id
WHERE reviews.id = 28

内部在WP环境中连接SQL，其中id = id

1 个答案: