mysql - 如何为 3 列编写查询 DISTINCT

Question

我想按(客户、prop1、prop2)对每组唯一行的状态求和。 像这样:DISTINCT(client, prop1, prop2)

这是我的 table :

client  |  prop1  | prop2  | status
----------------------------------
name1   |  pr100  | pr310  | OK
name1   |  pr100  | pr310  | error
name1   |  pr100  | pr310  | OK
name1   |  pr100  | pr310  | OK
name2   |  pr255  | pr320  | OK
name2   |  pr255  | pr320  | OK
name2   |  pr255  | pr320  | error
name2   |  pr400  | pr320  | error
name3   |  pr400  | pr500  | OK
name3   |  pr400  | pr500  | OK

我试图得到这个:

client  |  prop1  | prop2  | OK  | error
----------------------------------
name1   |  pr100  | pr310  | 3   |  1
name2   |  pr255  | pr320  | 2   |  1
name2   |  pr400  | pr320  | 0   |  1
name3   |  pr400  | pr500  | 2   |  0

请帮忙

Answer 1

这是一个聚合，而不是select distinct:

select client, prop1, prop2,
       sum(status = 'OK') as ok, sum(status = 'error') as error
from t
group by client, prop1, prop2;