我有这张桌子
create table votes(
candidate varchar(20),
voteup bool
)
我想展示这样的东西
|candidate|vote ups(true)|vote downs(false)|vote points(true-false)
|hitler |16 |104 |-88
|obama |119 |1 |118
最佳答案
您可以“滥用”布尔值在整数运算中计算为1和0的事实:
select candidate,
sum(voteup) as 'vote up',
sum(voteup=0) as 'vote down',
sum(if(voteup,1,-1)) as 'vote points'
from votes
group by candidate;
关于mysql - 如何在MySQL上分隔 bool 列值,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/28379069/