Question

通过比较值，我在投射CurrRunDate时遇到问题。

SELECT
    s.Cid, 
    s.MobileNo, 
    AvailableBalance = (SELECT dbo.GetAvailBalAmt(acc,0)/100 FROM SMSCIF), 
    b.CurrRunDate,
    s.CreatedDate,
    s.ExpiryDate,       
    CAST (CASE WHEN
                  b.CurrRundate < s.ExpiryDate THEN '00' 
                  ELSE '01' 
          END) AS RenewStatus
FROM
    SMSCIF s
LEFT JOIN 
    BRPARMS b ON s.br = b.br
WHERE 
    (CAST(s.CreatedDate AS DATE) = b.CurrRundate AND s.status = '00') 
    OR Cast(s.ExpiryDate As Date) = b.CurrRundate

错误消息：“投放”附近的语法不正确，预期为“ AS”。

Answer 1

您需要CAST( (CASE expression) AS VARCHAR(2))，当前查询有语法错误。

将其更改为下面的查询将起作用：

 CAST ((CASE WHEN b.CurrRundate < s.ExpiryDate THEN '00' 
            ELSE '01' END) 
 AS VARCHAR(2)) AS RenewStatus,

Answer 2

为表达式分配别名不需要CAST；删除CAST：

CASE
    WHEN b.CurrRundate < s.ExpiryDate THEN '00' 
    ELSE '01' 
END AS RenewStatus

当我尝试同时使用CAST和CASE WHEN时，其说法错误

2 个答案: