按条件和多个排序列或其他条件排序

Question

我希望能够根据所选参数使用不同列进行排序。 我可以得到它的单列工作，但挣扎与多个。 任何帮助将不胜感激。

ORDER BY 
CASE WHEN @a like '%apples%' or @a like '%onions%' then 
DeliveryScheduleItems.DropSequence, 
DeliveryAddresses.PostalCode, 
Customers.CustomerId 
Else 
DeliverySchedules.DeliveryDate, 
DeliveryAddresses.PostalCode, 
Customers.CustomerId 
End 

Answer 1

试试这个，

ORDER BY 
CASE 
WHEN @a like '%apples%' or @a like '%onions%' then 
DeliveryScheduleItems.DropSequence, 
DeliveryAddresses.PostalCode, 
Customers.CustomerId 
WHEN @a not like '%apples%' AND @a not like '%onions%' then 
DeliverySchedules.DeliveryDate, 
DeliveryAddresses.PostalCode, 
Customers.CustomerId 
End 

Answer 2

您需要多个条件：

ORDER BY (CASE WHEN @a like '%apples%' or @a like '%onions%' 
       THEN DeliveryScheduleItems.DropSequence 
      END), 
     (CASE WHEN @a like '%apples%' or @a like '%onions%' 
       THEN NULL 
       ELSE DeliverySchedules.DeliveryDate 
      END), 
     DeliveryAddresses.PostalCode, 
     Customers.CustomerId 

注意使用两个CASE表现为两个不同的列。据推测，DeliveryDate和DropSequence有不同的类型。最好单独订购。