如何从mysql表中获取随机行

Question

我的Sql查询是：

SELECT g.name, g.description, g.hash, g.views FROM c7_groups g, c7_groups_affiliations ga, c7_groups_categories gc WHERE ga.groups_hash = g.hash AND ga.groups_categories_id = gc.id AND g.groups_categories_id = 611
AND LOWER(ga.name) LIKE LOWER('%$school_name%')

如何在每次触发时使此查询获取一些Random行。

由于 Zeeshan

Answer 1

很简单，ORDER BY RAND（）：

  

SELECT g.name，g.description，g.hash，g.views FROM c7_groups g，c7_groups_affiliations ga，c7_groups_categories gc WHERE ga.groups_hash = g.hash AND ga.groups_categories_id = gc.id AND g.groups_categories_id = 611   AND LOWER（ga.name）LIKE LOWER（'％$ school_name％'）ORDER BY RAND（）

有关效果提示，请参阅http://dev.mysql.com/doc/refman/5.0/en/order-by-optimization.html

Answer 2

  

ORDER BY RAND（）

在查询结束时。不推荐。

Answer 3

SELECT g.name, g.description, g.hash, g.views FROM c7_groups g, c7_groups_affiliations ga, c7_groups_categories gc WHERE ga.groups_hash = g.hash AND ga.groups_categories_id = gc.id AND g.groups_categories_id = 611
AND LOWER(ga.name) LIKE LOWER('%$school_name%') ORDER BY RAND();

然而，这是一个非常可怕的想法。