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from what i know. &nbsp;you can't detach a 2008 database and reattach it to a 2012 instance. &nbsp;<br />
Can someone confirm that you can only attach and detach between the same major version of sql server.<br />
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Also... you can backup and restore to a higher version of sql server.<br />
ie.... backup a db on a 2008 sql server and restore it on 2012 sql server.<br />
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you can not go backwards in backup restore tho<br />
ie backup 2012 db and restore to 2008
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from what i know.  you can't detach a 2008 database and reattach it to a 2012 instance.  
Can someone confirm that you can only attach and detach between the same major version of sql server.

Also... you can backup and restore to a higher version of sql server.
ie.... backup a db on a 2008 sql server and restore it on 2012 sql server.

you can not go backwards in backup restore tho
ie backup 2012 db and restore to 2008

Confirm Attach/Detach     backup/restore  logic

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.