Oracle - count()在同一行

Question

我是这里的新用户,我认为这太棒了!我需要一些帮助:

我这样做,但不要像我想的那样工作!(count(countOfCat)不好!)

select count(countOfCat) as "Cat", count(countOfDog) as "dog", count(countOfHorse) as "horse", 0 as "duck", 0 as "Mouse"
from animal
where Birthdate in
        (...
         -- i think not important
         ...
        )
        and ( species= 'cat' or species= 'dog' or species= 'horse')
group by species

我想要收到这样的

Cat     Dog     Horse   Duck   mouse
------- ------- ------- ------  -------
1234    2345    3456     0      0

...

我需要所有计数都在同一行.
我不能利用这个

noGood- Cat   Dog     Horse   Duck    mouse
noGood- ----- ------ -------- ------- -------
noGood- 1234  0       0       0         0
noGood- 0     2345    0       0         0
noGood- 0     0       3456    0         0

谢谢你的时间!
哒!

Answer 1

select sum(case when species = 'cat' then 1 else 0 end) as "Cat", 
       sum(case when species = 'dog' then 1 else 0 end) as "Dog", 
       sum(case when species = 'horse' then 1 else 0 end) as "Horse", 
       0 as "duck", 
       0 as "Mouse"
from animal
where species in ('cat', 'dog', 'horse')