按一列排序，然后按另一列排序

Question

我有SQL Fiddle，表格如下所示

TicketId    EmployeeId  BookingRef  DepartureDate   DepartureTime      
1           1110341     8662225387  2017-10-16      14:00:00.0000000    
2           1110341     8662225388  2017-10-17      14:36:00.0000000    
3           1110341     8662225388  2017-10-17      21:39:00.0000000    
4           1110341     8662225389  2017-10-12      17:15:00.0000000    
5           1110341     8662225390  2017-10-12      18:42:00.0000000    
6           1110341     8662225390  2017-10-16      14:15:00.0000000    

我想通过DepartureDate，DepartureTime和BookingRef订购，但是相关的BookingRef应该被分区在一起所以上面的结果应该是

TicketId    EmployeeId  BookingRef  DepartureDate   DepartureTime      
4           1110341     8662225389  2017-10-12      17:15:00.0000000    
5           1110341     8662225390  2017-10-12      18:42:00.0000000    
6           1110341     8662225390  2017-10-16      14:15:00.0000000    
1           1110341     8662225387  2017-10-16      14:00:00.0000000
2           1110341     8662225388  2017-10-17      14:36:00.0000000    
3           1110341     8662225388  2017-10-17      21:39:00.0000000

Answer 1

我会使用子查询来进行排序，就像这样;

SELECT 
  t.*
FROM Ticket t
JOIN (SELECT BookingRef, MIN(DepartureDate) MinDeparture FROM Ticket GROUP BY BookingRef) sub
  ON t.BookingRef = sub.BookingRef
ORDER BY sub.MinDeparture ASC, t.BookingRef ASC

它给出了您显示的输出。在小提琴here

中查看

这将按每个BookingRef的最小DepartureTime订购。

Answer 2

你想'分组'

  

SELECT column_names FROM table_name WHERE condition GROUP BY   BookingRef ORDER BY column_name;