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Re:Announcing SQL Server on Linux by aninteger on Monday March 07, 2016 @05:25PM (#11242251)
Sadly not open source and no ability to use it with CentOS 6.
Re:Announcing SQL Server on Linux by teh_klev on Tuesday March 08, 2016 @04:14AM (#11244259)
Support for RedHat 5, 6 and 7 so it'll work on CentOS 6 which is re-packaged, de-branded RHEL:

https://www.microsoft.com/en-us/download/details.aspx?id=364...

Can't really help you with the open source side of things.