获取sqlite中的重复次数

Question

此表的操作方式

获取此表（对等方应相同，即，其中peer =程序中指定的对等方）
动作0为减，动作1为加

Answer 1

您似乎想要一个简单的汇总：

select whom, sum(action) as plus, sum(1 - action)  as minus
from t
group by whom;

Answer 2

有条件聚合：

select
  whom,
  sum(action = 1) plus,
  sum(action = 0) minus
from tablename
where peer = ?
group by whom