由于目前还广泛使用着SQLServer2000，很多公司又想使用新的SQLServer，从而直接【分离/附加】或者【备份/还原】数据库，在不同版本之间存放。往往就会遇到版本不兼容的问题。前几天遇到了从我本机2008R2上备份的一个数据库还原到2008上面时报错：

从运行版本10.50.2500（2008R2是10.50）和10.00.1600（2008是10.00）中可以看出这个版本不兼容问题，大部分情况下，从低版本升级到高版本，只要不是跨度太大，如2000升级到2012，都不会怎么报错。除非使用了一些新版本不兼容的特性如*=来实现left join的语句。但是就像上图那样，从高版本还原到低版本的时候，问题就出现了，而且几乎一定会报错。

下面给出几个小建议，例子是从2008 降级到2005：

方法一：使用图形化操作（GUI），打开SSMS(SQL Server Management Studio)

步骤1：右键你要降级的数据库，按下图选择：

步骤2：在对话框中选择：

步骤3：在【高级】中选择下图：

步骤4：把脚本保存起来，然后在SQLServer2005中运行脚本。

步骤5：通过【任务】→【导入数据】，把数据从2008导入到使用脚本创建的库上如下图，就完成了：

方法二：使用系统自带的存储过程实现：sp_dbcmptlevel ——将某些数据库行为设置为与指定的 SQL Server 版本兼容

下面是其内部实现代码：

SET QUOTED_IDENTIFIER ONSET ANSI_NULLS ONGOcreate procedure sys.sp_dbcmptlevel         -- 1997/04/15@dbname sysname = NULL,                  -- database name to change@new_cmptlevel tinyint = NULL OUTPUT    -- the new compatibility level to change toasset nocount    ondeclare @exec_stmt nvarchar(max)declare @returncode intdeclare @comptlevel float(8)declare @dbid int                  -- dbid of the databasedeclare @dbsid varbinary(85)        -- id of the owner of the databasedeclare @orig_cmptlevel tinyint      -- original compatibility leveldeclare @input_cmptlevel tinyint    -- compatibility level passed in by user,@cmptlvl80 tinyint                -- compatibility to SQL Server Version 8.0,@cmptlvl90 tinyint              -- compatibility to SQL Server Version 9.0,@cmptlvl100 tinyint             -- compatibility to SQL Server Version 10.0select  @cmptlvl80 = 80,@cmptlvl90 = 90,@cmptlvl100 = 100-- SP MUST BE CALLED AT ADHOC LEVEL --if (@@nestlevel > 1)beginraiserror(15432,-1,-1,'sys.sp_dbcmptlevel')return (1)end-- If no @dbname given, just list the valid compatibility level values.if @dbname is nullbeginraiserror (15048, -1, -1, @cmptlvl80, @cmptlvl90, @cmptlvl100)return (0)end--  Verify the database name and get infoselect @dbid = dbid, @dbsid = sid ,@orig_cmptlevel = cmptlevelfrom master.dbo.sysdatabaseswhere name = @dbname--  If @dbname not found, say so and list the databases.if @dbid is nullbeginraiserror(15010,-1,-1,@dbname)print ' 'select name as 'Available databases:'from master.dbo.sysdatabasesreturn (1)end-- Now save the input compatibility level and initialize the return clevel-- to be the current clevelselect @input_cmptlevel = @new_cmptlevelselect @new_cmptlevel = @orig_cmptlevel-- If no clevel was supplied, display and output current level.if @input_cmptlevel is nullbeginraiserror(15054, -1, -1, @orig_cmptlevel)return(0)end-- If invalid clevel given, print usage and return error code-- 'usage: sp_dbcmptlevel [dbname [, compatibilitylevel]]'if @input_cmptlevel not in (@cmptlvl80, @cmptlvl90, @cmptlvl100)beginraiserror(15416, -1, -1)print ' 'raiserror (15048, -1, -1, @cmptlvl80, @cmptlvl90, @cmptlvl100)return (1)end--  Only the SA or the dbo of @dbname can execute the update part--  of this procedure sys.so check.if (not (is_srvrolemember('sysadmin') = 1)) and suser_sid() <> @dbsid-- ALSO ALLOW db_owner ONLY IF DB REQUESTED IS CURRENT DBand (@dbid <> db_id() or is_member('db_owner') <> 1)beginraiserror(15418,-1,-1)return (1)end-- If we're in a transaction, disallow this since it might make recovery impossible.set implicit_transactions offif @@trancount > 0beginraiserror(15002,-1,-1,'sys.sp_dbcmptlevel')return (1)endset @exec_stmt = 'ALTER DATABASE ' + quotename(@dbname, '[') + ' SET COMPATIBILITY_LEVEL = ' + cast(@input_cmptlevel as nvarchar(128))-- Note: database @dbname may not exist anymoreexec(@exec_stmt)select @new_cmptlevel = @input_cmptlevelreturn (0) -- sp_dbcmptlevelGO

语法

sp_dbcmptlevel [ [ @dbname = ] name ] [ , [ @new_cmptlevel = ] version ]

返回代码值

注意事项：