在mySQL中显示数据时计算行数

Question

我有两个问题

select TC,li,it as ee from results 
where li = "not_applicable" and cpirt = "uu_X1"

以上查询将输出10个结果， 但如果我把计数放在同一个查询中，那么只有一个结果。

select TC,li,it,COUNT(TC) as ee from results 
where li = "not_applicable" and cpirt = "uu_X1"

如何使用MYSQL

使第二个查询输出每个TC的计数

感谢。

Answer 1

添加GROUP BY TC。

我愿意：

select TC,COUNT(TC) as ee from results 
where results.li = "not_applicable" and results.cpirt = "uu_X1"
GROUP BY TC