Question

这是我的桌子

Event           Time    Order           Mission         TimeStamp
arrived         14:50   281475024521271 281475024568005 2017-08-09 14:50:59
nextDelivery    14:51   281475024521271 281475024568005 2017-08-09 14:51:33
arrived         15:27   281475024521271 281475024568005 2017-08-09 15:27:13
nextDelivery    15:28   281475024521271 281475024568005 2017-08-09 15:28:04

这是我的查询：

with times as(
    select 
        event,
        to_char("timestamp"::timestamptz at time zone 'Europe/Rome', 'HH24:MI') as Time,
        orders,
        mission,
        "timestamp"::timestamptz at time zone 'Europe/Rome' as TimeStamp
    from main_source_execevent
    where orders = '281475024521271'
    and event in ('arrived', 'nextDelivery')
    order by "timestamp"
)
    select 
        case when event = 'arrived' then time end as TimeIN,
        case when event = 'nextDelivery' then time end as TimeOUT,
        orders  
    from Times

查询结果为：

    TimeIN   TimeOut  Order
    14:50    NULL     281475024521271
    NULL     14:51    281475024521271
    15:27    NULL     281475024521271
    NULL     15:28    281475024521271

我要实现的是将订单的timein和timeout放在同一行上。我不知道如何获得这个结果。你能帮我吗？

所需结果：

 TimeIN   TimeOut  Order
 14:50    14:51     281475024521271
 15:27    15:28     281475024521271

编辑：添加的信息

联接应该在到达和下一个传递之间使用最接近的时间戳，以便如预期结果中所述，只能有一对timein / timeout。

Answer 1

注意：这将回答问题的原始版本，而不是新的扩展版本。尽管这只是部分答案，但我会一直坚持下去，直到添加一个更好的答案为止。

在联接条件包含“超时”事件的值时使用自我联接，并将主表限制为“超时”事件：

select tin."order", 
       tin."timestamp" as time_in, 
       tout."timestamp" as time_out
from main_source_execevent tin 
  left join main_source_execevent tout on tin."order" = tout."order" and tout.event = 'nextDelivery'
where tin.event = 'arrived'  
  and tin.order = 281475024521271

在线示例：http://rextester.com/QMZO32570

使用("order", event)上的索引，这应该非常有效

Answer 2

我认为顺序和任务价值很重要，并且加入的双方都应该相等。区别于返回第一行以获取括号内各列的唯一值。如果您删除“ and mse1.order = 281475024521271”行，并将返回所有订单/任务的结果

select distinct on (mse1.order, mse1.timestamp)
       mse1.timestamp time_in, 
       max(mse2.timestamp) time_out,
       mse1.order
  from main_source_execevent mse1
       main_source_execevent mse2
 where mse1.order = mse2.order 
   and mse1.mission = mse2.mission
   and mse1.event = 'arrived'
   and mse2.event = 'nextDelivery' 
   and mse1.order = 281475024521271
 order by mse1.order, mse1.timestamp, mse2.timestamp

如何在同一行中放置不同的值

2 个答案: