Question

该查询为什么不停止在15点？这是我的查询。

SELECT title, type, profile
FROM playlists
WHERE active='1' AND feature='1' AND type='3' AND user='1'
ORDER BY RAND()
AND LIMIT 15

这会产生数十条记录，我每次只希望显示15个随机结果。我在俯视什么？

Answer 1

您需要删除关键字AND之前的LIMIT。

$sql = "SELECT title, type, profile FROM playlists WHERE active='1' AND feature='1' AND type='3' AND user='1' ORDER BY RAND()  LIMIT 15";

Answer 2

您可以尝试以下操作-您需要在AND之前删除LIMIT

SELECT title, type, profile FROM playlists WHERE active='1' AND feature='1' 
AND type='3' AND user='1' 
ORDER BY RAND() 
LIMIT 15

Answer 3

此处是用于随机分配结果的有用链接。选中here。

您的代码仅适用于MySQL。对于PostgreSQL和sqlite，请使用RANDOM()。对于SQL Server，请使用NEWID()。对于PostgreSQL和sqlite

$sql = "SELECT title, type, profile FROM playlists WHERE active='1' AND feature='1' AND type='3' AND user='1' ORDER BY RANDOM() LIMIT 15";

对于SQl服务器

$sql = "SELECT title, type, profile FROM playlists WHERE active='1' AND feature='1' AND type='3' AND user='1' ORDER BY NEWID() FETCH NEXT 15 ROWS ONLY";

请注意SQL Server中限制的不同用法。有一个问题。 Link。

SQL，按RANDOM和LIMIT排序不起作用？

3 个答案: