MySql求和查询

Question

我需要一个 MySql 查询来执行以下操作： 选择表中的所有项目，按类型分组，按计数类型排序，并对所有计数求和。

这是我到目前为止所做的：

select type, count(*) as cnt from $tbl_name group by type order by count(*) desc;

这只给我每个组的计数。我应该添加什么，以便此代码也显示总计数（每个组的计数总和）。

Answer 1

select * from (
select type as type, 
count(*) as cnt 
from $tbl_name 
group by type WITH ROLLUP) as inner_table
order by cnt desc;

请注意，第一行将是汇总的总和。

ROLLUP reference

Answer 2

试试这个：

select type, SUM(count(*)) as cnt from $tbl_name group by type order by count(*) desc;