Question

我已经编写了一些Sql代码，通过使用dateOffered字段显示所有客户的提议即将在未来90天内到期。但是，数据库中有另一个名为OfferExpirydate的字段，我会使用此字段，但它并不总是填写。

我的问题是我希望代码查看OfferExpirydate，如果它有值，则使用它，否则使用Dateoffered字段作为我的代码在stats下面。（如果未填写OfferExpirydate，则将其设置为NULL）任何有关这方面的帮助都非常感谢

SELECT      
DateOffered,
      pr.ClientID,
      pr.id AS profileID,
      cf.Clntnme,
      pm.Lender,
      ABS(DATEDIFF(DAY, DateOffered, DATEADD(d,-90, GETDATE()))) AS 'NoOfDays'
FROM tbl_profile AS pr 
INNER JOIN tbl_Profile_Mortgage AS pm
      ON pr.id = pm.fk_profileID
INNER JOIN dbo.tbl_ClientFile AS cf
      ON pr.ClientID = cf.ClientID
WHERE 
DateCompleted IS NULL AND
DateOffered >  DATEADD(d,-90, GETDATE())
AND DATEDIFF(DAY, DateOffered, DATEADD(d,-90, GETDATE())) > -15
ORDER BY DateOffered ASC

Answer 1

COALESCE(col1, col2, ...)

将选择第一个非空值。

Answer 2

试试这个：

SELECT DateOffered,
       pr.ClientID,
       pr.id AS profileID,
       cf.Clntnme,
       pm.Lender,
       ABS(DATEDIFF(DAY, DateOffered, DATEADD(d,-90, GETDATE()))) AS 'NoOfDays'
FROM tbl_profile AS pr 
INNER JOIN tbl_Profile_Mortgage AS pm
      ON pr.id = pm.fk_profileID
INNER JOIN dbo.tbl_ClientFile AS cf
      ON pr.ClientID = cf.ClientID
WHERE DateCompleted IS NULL AND 
1 = CASE WHEN OfferExpirydate IS NOT NULL AND DATEDIFF(DAY, OfferExpirydate, GETDATE()) > -15 THEN 1 
        WHEN DateOffered >  DATEADD(d,-90, GETDATE()) AND DATEDIFF(DAY, DateOffered, DATEADD(d,-90, GETDATE())) > -15 THEN 1 
        ELSE 0
    END
ORDER BY DateOffered ASC

如果field = Null则使用不同的字段

2 个答案: