SQL过滤器 - 使用多个列的组合进行过滤

Question

表1

person    | zipcode     | timestamp               | event  | device
--------------------------------------------------|--------|------
amar      | 11111       | 2016-09-28 20:05:03.001 | email  | phone
akbar     | 11111       | 2016-09-28 20:05:03.001 | email  | phone  
antony    | 11111       | 2016-09-28 20:07:03.001 | chat   | pc
amar      | 11111       | 2016-09-28 20:08:03.001 | email  | phone
amar      | 11111       | 2016-09-28 20:08:03.001 | chat   | phone
amar      | 22222       | 2016-09-28 20:09:03.001 | email  | phone
akbar     | 22222       | 2016-09-28 20:10:03.001 | email  | phone  
antony    | 22222       | 2016-09-28 20:10:03.001 | chat   | phone
amar      | 11111       | 2016-09-28 21:05:03.001 | email  | phone
akbar     | 11111       | 2016-09-28 21:05:03.001 | email  | phone  
antony    | 11111       | 2016-09-28 21:07:03.001 | chat   | phone

所需输出 记录 对于存在pc设备的记录的所有小时的所有邮政编码

以上示例

的输出表

唯一符合条件的zipcode, timestamp_hour组合是11111, 2016-09-28 20

person    | zipcode     | timestamp               | event  | device
--------------------------------------------------|--------|------
amar      | 11111       | 2016-09-28 20:05:03.001 | email  | phone
akbar     | 11111       | 2016-09-28 20:05:03.001 | email  | phone  
antony    | 11111       | 2016-09-28 20:07:03.001 | chat   | pc
amar      | 11111       | 2016-09-28 20:08:03.001 | email  | phone
amar      | 11111       | 2016-09-28 20:08:03.001 | chat   | phone

伪代码

1. 使用过滤器zipcode, timestamp_hour创建device='pc'组合的临时表，以获得符合条件的zipcode, timestamp_hour列表
2. 将＃1应用为table1
的过滤器

对于上面的＃1，我的代码如下，需要＃2

的帮助

with zipcode_hour as (
  select zipcode,   date_trunc(`hour`, timestamp) as timestamp_hour
      from table1
      where device = 'pc'
      group by zipcode, timestamp_hour
)

Answer 1

您可以使用以下查询

SELECT person
    ,zipcode
    ,timestamp1
    ,event
    ,device
FROM table1 a
WHERE EXISTS (
        SELECT 1
        FROM table1 b
        WHERE b.device = 'pc'
            AND date_trunc('hour', a.timestamp1) = date_trunc('hour', b.timestamp1)
            AND a.zipcode = b.zipcode
        );

完整结果SQLFiddle

Answer 2

您可以使用自联接和where子句

进行过滤

select distinct t1.person, t1.zipcode, t1."timestamp", t1.event, t1.device
from table1 t1
join table1 t2 on t2.zipcode = t1.zipcode
               and date_trunc('hour', t2."timestamp") = date_trunc('hour', t1."timestamp")
where t2.device = 'pc'

这会查找具有相同t1.*, t2.device和zipcode的所有条目hour，但仅保留t2.device为pc的条目。 <{1}}关键字需要清除重复的条目。