With the Release of SCCM Configmgr 2012 SP1 RTM,When you deploy Secondary Site from its Parent site ,it will install SQL Server Express 2008 R2 Service Pack 1 (SP1) but as you can see from below snap (SQL server Requirements),the minimum required cumulative update is CU6 which you will have to install it manually.
What is new in Configuration Manager 1910 reporting
Download SCCM ConfigMgr and Intune slide decks and videos from Ignite 2019
SCCM ConfigMgr technical preview version 1911 is available (in-console and baseline version) – Microsoft Endpoint Configuration Manager
How to scale your SCCM infrastructure for third-party patching, remote client operations, and application management via a single plug-in ?