Question

这是我的sql当我尝试执行它然后我收到错误消息msg 在预期条件的上下文中指定的非布尔类型的表达式，接近'then'。 < / p>

我无法理解我犯错误的地方。所以请特别查看我的完整SQL，我会使用嵌套的情况并告诉我应该纠正什么。

SELECT                 
        [bbajobs].[jid],                
        [Add Dates],    
    CASE WHEN 1 then 'Yes'      
        CASE WHEN 0 then 
            CASE WHEN job_flow_state.no_fault_found   = 1 THEN 'No fault found'         
            CASE WHEN job_flow_state.unable_to_repaired  = 1 THEN 'Unable to repair'       
            CASE WHEN job_flow_state.Repair_Not_Requested = 1 THEN 'Repair Not Requested'               
            ELSE 'N/A'  
        END  
    END AS [Repaired]
    FROM   bbajobs            
        LEFT JOIN ourfeedback                
        ON bbajobs.jid = ourfeedback.jid                
        INNER JOIN job_flow_state                
        ON bbajobs.jid = job_flow_state.jid                
        WHERE CONVERT(VARCHAR(8), bbajobs.jobshippeddate, 112) >='20140117'               
        AND CONVERT(VARCHAR(8), bbajobs.jobshippeddate, 112) <='20140117' AND bbajobs.jobstate IN ('DONE')                 
        AND bbajobs.jobtype NOT LIKE '%warranty%'                
        AND job_flow_state.repaired = 1             
  AND (ltrim(rtrim(ourfeedback.Rating))='' OR ltrim(rtrim(ourfeedback.Rating))='N/A') AND [bbajobs].[accountreference] IN                
  (SELECT accountref FROM ourfeedback where           
   CONVERT(VARCHAR(8), ourfeedback.adddates, 112) >='20140117' AND CONVERT(VARCHAR(8), ourfeedback.adddates,112) <= '20140117'            
  )

使用嵌套案例

CASE WHEN 1 then 'Yes'      
            CASE WHEN 0 then 
                CASE WHEN job_flow_state.no_fault_found   = 1 THEN 'No fault found'         
                CASE WHEN job_flow_state.unable_to_repaired  = 1 THEN 'Unable to repair'       
                CASE WHEN job_flow_state.Repair_Not_Requested = 1 THEN 'Repair Not Requested'               
                ELSE 'N/A'  
            END  
        END AS [Repaired]

Answer 1

我会像这样重写嵌套的case语句：

CASE WHEN 1 then 'Yes'      
     ELSE            
     CASE WHEN job_flow_state.no_fault_found = 1 THEN 'No fault found'         
          WHEN job_flow_state.unable_to_repaired = 1 THEN 'Unable to repair'       
          WHEN job_flow_state.Repair_Not_Requested = 1 THEN 'Repair Not Requested'               
          ELSE 'N/A'  
     END  
END AS [Repaired]

Answer 2

你的CASE太多了 - 你只需要在内部嵌套中WHEN s。您还需要打开谓词 - 即'什么'是1或0。最后，你应该考虑如果内部情况不匹配会发生什么。

即：

CASE SomeColumn 
     WHEN 1 then 'Yes'      
     WHEN 0 then 
        CASE WHEN job_flow_state.no_fault_found   = 1 THEN 'No fault found'
             WHEN job_flow_state.unable_to_repaired  = 1 THEN 'Unable to repair'
             WHEN job_flow_state.Repair_Not_Requested = 1 THEN 'Repair Not Requested'               
             ELSE 'Oops'
        END
     ELSE 'N/A'  
   END AS [Repaired];

SqlFiddle here

关于sql server 2005中的嵌套CASE语句的问题

使用嵌套案例

2 个答案: