SQL 在两行中查找有关 Person 的信息

Question

我必须关注名为 Data1 的数据库

DateOfBooking | Short   |  Long  |  TimeOfBooking  | ID
-------------------------------------------------------
14.06.2016    | KAL     |  blabla| 13:02           | 1
14.06.2016    | DEF     |  del   | 14:02           | 3
14.06.2016    | KAL     |  blabla| 17:34           | 2
14.06.2016    | DOL     |  blub  | 13:02           | 1

我想找到此人的 ID 是 13:02 的 KAL 和 13:02 的 DOL，但前提是两者都被预订（同时）。

KAL 和 DOL 总是在同一个 TimeOfBooking 为一个 ID 预订，但我不知道如何得到结果。我试过了

SELECT DISTINCT Data1.ID
FROM Data1
WHERE (((Data1.Short = 'KAL') AND (Data1.Long Like 'blabla')) 
AND ((((Data1.Short = 'DOL') AND (Data1.Long Like 'blub')))
Group BY Data1.ID

当然这不起作用，因为它只查看一行。有没有办法查看两行并找到相应的 ID？

谢谢。

Answer 1

不太确定您在问什么，但是当 KOL 和 DOL 具有相同的 ID 和时间戳时，这将 return 数据：

select tk.*, td.*
from (select * from data1 where Short = 'KAL') tk
join (select * from data1 where Short = 'DOL') td
  ON tk.id = td.id and tk.TimeOfBooking = td.TimeOfBooking

Answer 2

一种方法使用聚合，按 ID 和预订时间 -- 然后检查两个 short 值：

select d.id
from data1 d
where d.short in ('KAL', 'DOL')
group by d.id, d.timeofbooking
having count(distinct d.short) = 2;

如果你想要完整的记录，另一种方法是使用 exists，但有点复杂：

select d.*
from data1 d
where (d.short = 'KAL' and
       exists (select 1 from data1 d2
               where d2.id = d.id and
                     d2.timeofbooking = d.timeofbooking and
                     d2.short = 'DOL'
              )
      ) or
      (d.short = 'DOL' and
       exists (select 1 from data1 d2
               where d2.id = d.id and
                     d2.timeofbooking = d.timeofbooking and
                     d2.short = 'KAL'
              )
      );

或者，甚至，使用 window 函数：

select d.*
from (select d.*,
             min(short) over (partition by id, timeofbooking) as minshort,
             max(short) over (partition by id, timeofbooking) as maxshort
      from data1
      where short in ('KAL', 'DOL')
     ) d
where minshort <> maxshort;

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