如何获取mysql中某个表中特定列的总数和总行数

Question

这很简单，但无法弄清楚。

这里是我的表

a  b 
--------- 
s1 prod 
s2 prod 
s3 dev 
s4 prod 
s5 dev 

我所期待是

Environment count 
prod   3 
dev   2 
total  5 

所以跟团由环境领域也找了总数的一贯遵循。

Answer 1

UPDATE：

SELECT b AS Environment, COUNT(a) AS COUNT FROM <tablename> GROUP BY b UNION SELECT 'total' AS Environment, COUNT(a) AS COUNT FROM <tablename>; 

它可以帮助你