Question

为什么我的case语句会抛出此错误：

Msg 102，Level 15，State 1，Line 2 '='附近的语法不正确。

代码：

Create PROCEDURE [dbo].[Chart_SelectSmsComplaintsValidity]

 @FromDate datetime,
 @ToDate datetime

AS
BEGIN

    Select COUNT(ReceivedMessages.ID) As ReceivedMessageID, 
    CASE ReceivedMessages.IsComplaint WHEN ReceivedMessages.IsComplaint=0 
    THEN 'Incomplete'
    WHEN ReceivedMessages.IsComplaint=1 THEN 'Complete'
    WHEN ReceivedMessages.IsComplaint=-3 THEN 'Inappropriate' END from ReceivedMessages 

    where ReceivedMessages.ReceivedDateTime >= @FromDate AND ReceivedMessages.ReceivedDateTime <= @ToDate
    Group By ReceivedMessages.IsComplaint




END

Answer 1

您正在组合两种不同形式的CASE声明。您可以通过这种方式简化它，因为您在每种情况下都要比较相同的表达式：

CASE ReceivedMessages.IsComplaint
  WHEN 0  THEN 'Incomplete'
  WHEN 1  THEN 'Complete'
  WHEN -3 THEN 'Inappropriate' 
END from ReceivedMessages

替代方案是：

CASE
  WHEN ReceivedMessages.IsComplaint=0  THEN 'Incomplete'
  WHEN ReceivedMessages.IsComplaint=1  THEN 'Complete'
  WHEN ReceivedMessages.IsComplaint=-3 THEN 'Inappropriate' 
END

Answer 2

错误在此行

CASE ReceivedMessages.IsComplaint WHEN ReceivedMessages.IsComplaint=0

应该是这样的

CASE WHEN ReceivedMessages.IsComplaint=0 THEN 'Incomplete'
WHEN ReceivedMessages.IsComplaint=1 THEN 'Complete'
WHEN ReceivedMessages.IsComplaint=-3 THEN 'Inappropriate' END

为什么我的case语句会抛出错误，'='附近的语法不正确？

2 个答案: