sql - 试图获取去年的月份和日期，以及数据之前的年份

Question

我在这里构建了一个查询，用于检索从今天到 11 个月前的保单过期日期。

由于此查询确实会检索数据，因此我需要更改查询以从当前日期检索 1 年前和前一年的数据。

例如，我需要在 5/19/2013 和 5/19/2014 之间过期的保单。

我正在尝试使用函数调用，但不确定如何实现它。

这是我目前的数据，如下所示:

Customer Number| Name | EMail | Producer | Policy Expired

abcde-12345-fghij-67890 | Bob Builder | somewhere@email.com | 31000 | Dora Explorer | 2014-07-29
abcde-12345-fghij-67890 | Bob Builder | somewhere@email.com | 31000 | Dora Explorer | 2014-08-07
abcde-12345-fghij-67890 | Bob Builder | somewhere@email.com | 31000 | Dora Explorer | 2014-08-10

  SELECT DISTINCT   
                Customer.custno as [Customer Number], 
                CONCAT(Customer.FirstName, ' ', Customer.LastName) AS Name, 
                Customer.EMail,
                (isnull(Employee.Firstname + ' ','') + isnull(Employee.LastName,'')) AS Producer,
                BasicPolInfo.polexpdate as [Policy Expired]

  FROM 
                Customer INNER JOIN
                BasicPolInfo ON Customer.CustId = BasicPolInfo.CustId INNER JOIN
                Transaction ON BasicPolInfo.PolId = Transaction.PolId INNER JOIN
                GeneralLedgerBranch ON Customer.GLBrnchCode = GeneralLedgerBranch.GLBrnchCode INNER JOIN
                GeneralLedgerDepartment ON Customer.GLDeptCode = GeneralLedgerDepartment.GLDeptCode INNER JOIN
                GeneralLedgerDivision ON Customer.GLDivCode = GeneralLedgerDivision.GLDivCode INNER JOIN
                Employee ON BasicPolInfo.ExecCode = Employee.EmpCode

  WHERE 
                Customer.firstname IS NOT NULL 
                AND Customer.EMail IS NOT NULL 
                AND Customer.Active = 'Y' 
                AND Customer.typecust = 'P'
                AND BasicPolInfo.PolExpDate >= DATEADD(MONTH, -10,CONVERT(VARCHAR(11),GETDATE(),106))               
                AND BasicPolInfo.PolExpDate <= CONVERT(VARCHAR(11),GETDATE(),106) 
                AND BasicPolInfo.status <> 'D'
                AND GeneralLedgerDepartment.Name = 'Personal -'

  ORDER BY      BasicPolInfo.PolExpDate ASC

以上，我正在尝试翻译

AND BasicPolInfo.PolExpDate >= DATEADD(MONTH, -10,CONVERT(VARCHAR(11),GETDATE(),106))
AND BasicPolInfo.PolExpDate <= CONVERT(VARCHAR(11),GETDATE(),106)

进入 05/19/2013 到 05/19/2014 之间。我该怎么做？

网上查了下，没法下定论。

Answer 1

如果 BasicPolInfo.PolExpDate 是 DATE 数据类型，那么它就像

AND BasicPolInfo.PolExpDate BETWEEN 
  DATEADD(YEAR, -2, GETDATE()) 
  AND DATEADD(YEAR, -1, GETDATE())

如果你的数据类型是 DATETIME 并且你需要去除时间部分然后使用

AND BasicPolInfo.PolExpDate BETWEEN
  DATEADD(YEAR, -2, DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE()))) 
  AND DATEADD(YEAR, -1, DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE())))