[英]Percentage based on another column, with group by
这就是我所拥有的:
create table Test(day int, status varchar(50), transactions int);
insert into Test(day, status, transactions) values(5, "success", 105);
insert into Test(day, status, transactions) values(5, "success", 105);
insert into Test(day, status, transactions) values(5, "failure", 40);
insert into Test(day, status, transactions) values(6, "success", 40);
insert into Test(day, status, transactions) values(6, "failure", 32);
insert into Test(day, status, transactions) values(7, "success", 552);
insert into Test(day, status, transactions) values(7, "failure", 4);
select day, status, sum(transactions) from Test
group by day, status
得到这个:
day status sum(transactions)
5 success 210
5 failure 40
6 success 40
6 failure 32
7 success 552
7 failure 4
我想要额外的专栏,告诉我每天我的成功率是多少。 例如第 5 天210/(210+40)
,第 6 天 40/(32+40) 等:
day status sum(transactions) rate
5 success 210 0.8400
5 failure 40 0.1600
6 success 40 0.5556
6 failure 32 0.4444
7 success 552 0.9928
7 failure 4 0.0072
通过这种方式,您可以获得等效状态类型的比率(成功/失败)。
select t.day, t.status, sum(transactions), sum(transactions)/total as rate
from Test t inner join (select day, sum(transactions) as total from Test group by day) total
on t.day = total.day
group by t.day, t.status
Output:
day status sum(transactions) rate
5 failure 40 0.2759
5 success 105 0.7241
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