Question

我想选择3个最畅销的唱片，这是我的表

CREATE TABLE IF NOT EXISTS `contas` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `id_service` int(11) DEFAULT NULL,
  `data` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=28 ;

'id_service'是主列，销售越多，添加的记录越多，'id_service'相同。

那么如何在不使用PHP的情况下执行此操作并按降序选择？

我试过这个

select id_service, count(*) as id_service
from vendas WHERE id_service is not null
group by id_service order by id_service desc LIMIT 3

Answer 1

您将两个列别名为同一个名称。难怪查询混淆了。试试这个：

select id_service, count(*) as cnt
from vendas WHERE id_service is not null
group by id_service
order by cnt desc
LIMIT 3;

选择销售额较高的3件商品

1 个答案: