选择具有特定类型的关联记录的记录

Question

我们有2张桌子订票，票务。 Ticket.BookingId是Booking.Id的外键：

如何为仅包含类型1或3或7的票证的预订预订编写SQL select（与MS SQL Server兼容）？

如：

select Booking.Id
from Booking 
    join Ticket on Ticket.BookingId = Booking.Id
group by Booking.Id
having Ticket.Type IN (1,3,7)

例如，在这种情况下：

最终结果将为：2,3。

Booking.Id = 1不是最终结果，因为表中的票证是票证（Id = 4，BookingId = 1，Type = 8），因此此预订还包含除1或3或7外的其他票证类型

LINQ中的解决方案：

var result = (from b in Booking 
join t in Ticket on Booing.Id equals Ticket.BooingId
group new {b,t} by b.Id).Where(group => group.Where(itemOfGroup=>itemOfGroup.Ticket.Type != 1 && itemOfGroup.Ticket.Type != 3 && itemOfGroup.Ticket.Type != 7).Count() == 0 ).Select(group => group.Key);

Answer 1

按预订分组，仅接受没有其他类型的那些分组

select Booking.Id
from Booking 
join Ticket on Ticket.BookingId = Booking.Id
group by Booking.Id 
having sum(case when Ticket.Type NOT IN (1,3,7) then 1 else 0 end) = 0