Agreed. Doctrine Migrations[1] is excellent for managing SQL schema differences and migrations across all major RDBMs (MySQL/PGSQL/MSSQL/Oracle/etc). Both upgrading and downgrading is supported, as well as custom scripts and adjustments. Conceptually there is no reason why it couldn't be integrated into non-PHP environments and be used only as an SQL versioning tool.

[1] https://github.com/doctrine/migrations