摘要：
由于SQL Server 2000仍然被广泛使用，许多公司希望使用新的SQL Server直接将其存储在不同版本之间的数据库中。但是，如上图所示，当从较高版本恢复到较低版本时，会出现问题，并且几乎总是报告错误。以下是一些建议，例如，从2008降级到2005：方法1：使用图形操作打开SSMS步骤1：右键单击要降级的数据库，然后选择它，如下图所示：步骤2：在对话框中选择：步骤3：在对话框内选择：步骤4：保存脚本，然后在SQLServer2005中运行脚本。
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。
详细步骤可以看：http://bbs.csdn.net/topics/390438560?page=1#post-394316973 中的13楼的回复，有截图
步骤5：通过【任务】→【导出数据】，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 ON
- SET ANSI_NULLS ON
- GO
- createprocedure sys.sp_dbcmptlevel -- 1997/04/15
- @dbname sysname = NULL, -- database name to change
- @new_cmptlevel tinyint = NULLOUTPUT -- the new compatibility level to change to
- as
- set nocount on
- declare @exec_stmt nvarchar(max)
- declare @returncode int
- declare @comptlevel float(8)
- declare @dbid int -- dbid of the database
- declare @dbsid varbinary(85) -- id of the owner of the database
- declare @orig_cmptlevel tinyint -- original compatibility level
- declare @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 10.0
- select @cmptlvl80 = 80,
- @cmptlvl90 = 90,
- @cmptlvl100 = 100
- -- SP MUST BE CALLED AT ADHOC LEVEL --
- if (@@nestlevel > 1)
- begin
- raiserror(15432,-1,-1,'sys.sp_dbcmptlevel')
- return (1)
- end
- -- If no @dbname given, just list the valid compatibility level values.
- if @dbname isnull
- begin
- raiserror (15048, -1, -1, @cmptlvl80, @cmptlvl90, @cmptlvl100)
- return (0)
- end
- -- Verify the database name and get info
- select @dbid = dbid, @dbsid = sid ,@orig_cmptlevel = cmptlevel
- from master.dbo.sysdatabases
- wherename = @dbname
- -- If @dbname not found, say so and list the databases.
- if @dbid isnull
- begin
- raiserror(15010,-1,-1,@dbname)
- print ' '
- selectnameas'Available databases:'
- from master.dbo.sysdatabases
- return (1)
- end
- -- Now save the input compatibility level and initialize the return clevel
- -- to be the current clevel
- select @input_cmptlevel = @new_cmptlevel
- select @new_cmptlevel = @orig_cmptlevel
- -- If no clevel was supplied, display and output current level.
- if @input_cmptlevel isnull
- begin
- raiserror(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 notin (@cmptlvl80, @cmptlvl90, @cmptlvl100)
- begin
- raiserror(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 DB
- and (@dbid <> db_id() or is_member('db_owner') <> 1)
- begin
- raiserror(15418,-1,-1)
- return (1)
- end
- -- If we're in a transaction, disallow this since it might make recovery impossible.
- set implicit_transactions off
- if @@trancount > 0
- begin
- raiserror(15002,-1,-1,'sys.sp_dbcmptlevel')
- return (1)
- end
- set @exec_stmt = 'ALTER DATABASE ' + quotename(@dbname, '[') + ' SET COMPATIBILITY_LEVEL = ' + cast(@input_cmptlevel as nvarchar(128))
- -- Note: database @dbname may not exist anymore
- exec(@exec_stmt)
- select @new_cmptlevel = @input_cmptlevel
- return (0) -- sp_dbcmptlevel
- GO
SET QUOTED_IDENTIFIER ON
SET ANSI_NULLS ON
GO
create 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 to
as
set nocount on
declare @exec_stmt nvarchar(max)
declare @returncode int
declare @comptlevel float(8)
declare @dbid int -- dbid of the database
declare @dbsid varbinary(85) -- id of the owner of the database
declare @orig_cmptlevel tinyint -- original compatibility level
declare @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 10.0
select @cmptlvl80 = 80,
@cmptlvl90 = 90,
@cmptlvl100 = 100
-- SP MUST BE CALLED AT ADHOC LEVEL --
if (@@nestlevel > 1)
begin
raiserror(15432,-1,-1,'sys.sp_dbcmptlevel')
return (1)
end
-- If no @dbname given, just list the valid compatibility level values.
if @dbname is null
begin
raiserror (15048, -1, -1, @cmptlvl80, @cmptlvl90, @cmptlvl100)
return (0)
end
-- Verify the database name and get info
select @dbid = dbid, @dbsid = sid ,@orig_cmptlevel = cmptlevel
from master.dbo.sysdatabases
where name = @dbname
-- If @dbname not found, say so and list the databases.
if @dbid is null
begin
raiserror(15010,-1,-1,@dbname)
print ' '
select name as 'Available databases:'
from master.dbo.sysdatabases
return (1)
end
-- Now save the input compatibility level and initialize the return clevel
-- to be the current clevel
select @input_cmptlevel = @new_cmptlevel
select @new_cmptlevel = @orig_cmptlevel
-- If no clevel was supplied, display and output current level.
if @input_cmptlevel is null
begin
raiserror(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)
begin
raiserror(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 DB
and (@dbid <> db_id() or is_member('db_owner') <> 1)
begin
raiserror(15418,-1,-1)
return (1)
end
-- If we're in a transaction, disallow this since it might make recovery impossible.
set implicit_transactions off
if @@trancount > 0
begin
raiserror(15002,-1,-1,'sys.sp_dbcmptlevel')
return (1)
end
set @exec_stmt = 'ALTER DATABASE ' + quotename(@dbname, '[') + ' SET COMPATIBILITY_LEVEL = ' + cast(@input_cmptlevel as nvarchar(128))
-- Note: database @dbname may not exist anymore
exec(@exec_stmt)
select @new_cmptlevel = @input_cmptlevel
return (0) -- sp_dbcmptlevel
GO
语法- sp_dbcmptlevel [ [ @dbname = ] name ]
- [ , [ @new_cmptlevel = ] version ]
sp_dbcmptlevel [ [ @dbname = ] name ]
[ , [ @new_cmptlevel = ] version ]
- [ @dbname = ] name
要为其更改兼容级别的数据库的名称。数据库名称必须符合标识符的规则。name 的数据类型为 sysname，默认值为 NULL。
- [ @new_cmptlevel = ] version
数据库要与之兼容的 SQL Server 的版本。version 的数据类型为 tinyint，默认值为 NULL。该值必须为下列值之一：
80 = SQL Server 2000
90 = SQL Server 2005
100 = SQL Server 2008
0（成功）或 1（失败）
后续版本的 Microsoft SQL Server 将删除该功能。请不要在新的开发工作中使用该功能，并尽快修改当前还在使用该功能的应用程序。 改为使用 ALTER DATABASE 兼容级别。