sql - 或者使用 Group By 条件

Question

我有两张 table ，一张是观察者，另一张是动物。

我想知道看到超过 5 只动物或看到熊的观察者的名字。

我能够获得超过 4 只动物的观察者，但不确定如何进行 OR 语句。

这是我的代码:

SELECT o.last_name, o.first_name, a.observer_id, count (a.observer_id) as Animals_Seen
from animals as a inner join observer as o 
on a.observer_id = o.observer_id
group by a.observer_id, o.last_name, o.first_name
having count (a.observer_id) > 4;

这是我得到的:

Answer 1

每当发现熊时将 bool 值设置为 1...然后检查观察者的熊数是否 > 0:

select
    o.last_name, o.first_name, a.observer_id, count(a.observer_id) as Animals_Seen,
    sum(iif(a.animal = "bear", 1, 0)) as BearCount
from 
    animals as a inner join observer as o 
on 
    a.observer_id = o.observer_id
group by 
    a.observer_id, o.last_name, o.first_name
having
    count(a.observer_id) > 4 or sum(iif(a.animal = "bear", 1, 0)) > 0