使用PHP和MySQL

Question

如何計算具體的話我有簡單的MySQL表：

id server1 server2 
1  Yes  Yes 
2  Yes  No 
3  No  No 

我試圖做的是計算有多少「是」和「否」的每列中，然後用在圖表，數字（如highcharts）

Answer 1

select sum(server1 = 'Yes') as s1_yes, 
     sum(server2 = 'Yes') as s2_yes, 
     sum(server1 = 'No') as s1_no, 
     sum(server2 = 'No') as s2_no 
from your_table 

Answer 2

使用case語句這樣

select server1, 

sum(case when server1 = 'yes' then 1 else 0 end) as yes_count, 
sum(case when server1 = 'no' then 1 else 0 end) as no_count 

from yourtable