If relational integrity is by far and away the #1 concern, which open source DB should one choose? Firebird or PG?

I get the impression that MySQL is designed and used more as a data storage system than as relational model system. Correct?

In reply to Re^2: [OT] Why I don't use Mysql for new projects by kingkongrevenge
in thread [OT] Why I don't use Mysql for new projects by moritz

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