SQL SELECT所有记录所有

Question

所以有3个表

1通勤详细

2预订

3飞行

通勤

+----+------+ 
| id | name | 
+----+------+ 
| 1 | A | 
| 2 | B | 
| 3 | C | 
+----+------+ 

预订

+----+-------+ 
| id |flight | 
+----+-------+ 
| 1 | 101 | 
| 1 | 102 | 
| 1 | 103 | 
| 2 | 101 | 
| 3 | 104 | 
| 2 | 105 | 
+----+-------+ 

飞行

+--------+------+ 
| flight | late | 
+--------+------+ 
| 101 | 80 | 
| 102 | 80 | 
| 103 | 80 | 
| 104 | 10 | 
| 105 | 10 | 
+--------+------+ 

表1中包含passnger ID和名称

表2包含通勤ID和飞行ID

表3中包含航班号和分多少是

晚

现在我想找出所有航班迟到或迟到50分钟的passanger的名字

所以输出将是A因为101 102和103是晚80分钟

不B因为101是80分钟迟，但105是10分钟晚（不是所有的B的航班晚50）

所以我的做法是

select name from passanger,booking where passanger.id=booking.id and booking.flight = ALL (select flight.flight from flight where flight.late>50) 

不能得到所需的输出。

Answer 1

您可以按名称进行分组，并检查一个乘客的所有航班是否晚于having条件。

select p.name 
from passanger p 
join booking b on p.id=b.id 
join flight f on f.flight = b.flight 
group by p.name 
having count(*) = count(case when f.late>50 then f.flight end) 

Answer 2

试试这个：

select name from passanger, booking 
where passanger.id = booking.id 
and booking.flight in (select flight.flight from flight 
         where flight.late > 50) 

或

select name from passanger, booking, flight 
where passanger.id = booking.id and booking.flight = flight.flight and flight.late > 50 

这将导致一个名字3倍和b的名字一次，但如果你想只有一个的实例和b结果，您可以使用select distinct name。

Answer 3

select ps.name from passanger ps left join booking bk on (ps.id = bk.id) left join flight fl on (fl.flight = bk.flight) where late >50