使用下一条记录的数据更新SQL Server单元格数据

时间:2012-09-28 10:33:00

标签: sql sql-server database sql-update

我必须更新我的一个错误更新的SQL Server表的数据,这导致一行单元格的数据覆盖了下一行。以下是表应该处于正确状态的示例:

FirstName      LastName     EmailID
--------------------------------------------------
abc            xyz          abc.xyz@something.com
def            321          def.321@something.com
ghi            123          ghi.123@something.com

错误的数据已成为:

FirstName   LastName    EmailID
---------------------------------------------
abc         xyz         something
def         321         abc.xyz@something.com
ghi         123         def.321@something.com

我知道最后一条记录将无法找到,但至少其他记录应该正确恢复

1 个答案:

答案 0 :(得分:1)

假设您的表按firstName排序,lastName可以使用:

declare @contact as table (firstName varchar(255), lastName varchar(255), emailID varchar(255))
insert into @contact (firstName, lastName, emailID)
values
    ('abc', 'xyz', 'something')
    ,('def', '321', 'abc.xyz@something.com')
    ,('ghi', '123', 'def.321@something.com');


with contactCTE(rowNo, firstName, lastName, emailID) 
as
(
    select 
        ROW_NUMBER() OVER (ORDER BY firstName, lastName DESC)
        ,firstName 
        ,lastName 
        ,emailID 
    from
        @contact 
)
update c1   
set
    emailID = c2.emailID 
from 
    contactCTE c1
    inner join contactCTE c2 on c1.rowNo +1 = c2.rowNo;

select * from  @contact     

如果您的数据的排序方式不同,请修改ORDER BY中的contactCTE部分以反映此