我已加入两个表时如何使用DESC限制3

Question

我有两个表的joinend，它像它应该的那样工作，但是现在我想使用DESC限制，但是我不知道我应该把它放在哪里

$query = 'SELECT * FROM posts INNER JOIN category ON posts.catid=category.id;';
$select_all_posts_query = mysqli_query($link, $query);

Answer 1

如果您只想限制结果，则可以在查询中添加LIMIT 3：

$query = 'SELECT * FROM posts INNER JOIN category ON posts.catid=category.id; LIMIT 3';
$select_all_posts_query = mysqli_query($link, $query);

或者，如果您还尝试按降序排列结果，则还需要向查询中添加ORDER BY并

$query = 'SELECT * FROM posts INNER JOIN category ON posts.catid=category.id; ORDER BY posts.id DESC LIMIT 3';
$select_all_posts_query = mysqli_query($link, $query);

Answer 2

$query = 'SELECT * FROM posts INNER JOIN category ON posts.catid=category.id ORDER BY posts.catid=category.id DESC LIMIT 3 ';
$select_all_posts_query = mysqli_query($link, $query);