use master
go
select @@servername,serverproperty('servername')
------
IF serverproperty('servername')<>@@servername
BEGIN
DECLARE @server SYSNAME
SET @server=@@servername
EXEC sp_dropserver @server=@server
SET @server=cast(serverproperty('servername') AS SYSNAME)
EXEC sp_addserver @server=@server,@local='LOCAL'
END
ELSE
PRINT '实例名与主机名一致,无需修改!' 

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