SCCM 2012 R2 - SQL Requirements

Configuration Manager 2012 R2 requires the following SQL versions

SQL Server 2008 SP2 with Cumulative Update 9 or higher
SQL Server 2008 SP3 with Cumulative Update 4 or higher
SQL Server 2008 R2 SP1 with Cumulative Update 6 or higher
SQL Server 2008 R2 SP2 with no Cumulative Update
SQL Server 2012 with Cumulative Update 2 or higher
SQL Server 2012 SP1 with no Cumulative Update

Free ebook:Troubleshooting Configuration Manager

Free ebook: Microsoft System Center: Troubleshooting Configuration Manager
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http://blogs.msdn.com/b/microsoft_press/archive/2013/11/12/free-ebook-microsoft-system-center-troubleshooting-configuration-manager.aspx