具有前任的SQL列表帐户管理器

我有以下我似乎无法弄清楚.我正在尝试获取帐户中的帐户管理员列表,他们的开始/结束日期以及在一行中接管帐户的新帐户管理员.

例：

DECLARE @accountManagerListing TABLE 
                               (
                                    accountNumber INT,accountManager VARCHAR(8),accountManagerStartDate DATE,accountManagerEndDate DATE
                               )

INSERT INTO @accountManagerListing (accountNumber,accountManager,accountManagerStartDate,accountManagerEndDate)
VALUES  (1,'asmith','01/01/2001','01/31/2001'),(1,'bsmith','02/01/2001','03/01/2002'),'csmith','03/02/2002','03/10/2002'),'dsmith','03/11/2002','06/01/2017'),'esmith','06/02/2017','08/17/2018'),(2,'fsmith','02/11/2018','06/01/2018'),'gsmith','06/02/2018',null)

预期成绩：

Account Number  Old Account Manager  New Account Manager  Start Date  End Date

1                                    asmith               01/01/2001   01/31/2001
1               asmith               bsmith               02/01/2001   03/01/2002
1               bsmith               csmith               03/02/2002   03/10/2002
1               csmith               dsmith               03/11/2002   06/01/2017
1               dsmith               esmith               06/02/2017   08/17/2018
2                                    fsmith               02/11/2018   06/01/2018
2               fsmith               gsmith               06/02/2018   NULL

解决方法

select a.*,lag(accountManager) over (partition by accountnumber order by accountManagerStartDate) as OldAccountManager
from @accountManagerListing a;

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