按行数多个行的数学和

Question

我有一张桌子

user_name     id      status          calls
===========================================
apple        21       cars              67
apple        21       bikes             85
apple        21       skates            6
apple        21       pajs              56
orange       34       bikes             9
orange       34       disks             3
orange       34       cars              21
orange       34       pajs              76

我想将status's的所有调用添加为仅限汽车，自行车和冰鞋以及每个user_name。我已经遇到了SUM但经过几个小时的深夜，我认真地尝试了这个需要更多的东西。有人能指出我正确的方向吗？

My Table

Answer 1

select user_name, status, sum(calls) as calls
from table
where status in ('cars', 'bikes', 'skates')
group by user_name, status