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Re:Citus Data Donates 1% of Equity to PostgreSQL Organizations by sitharus on Wednesday October 24, 2018 @08:11PM (#18297581)
There's a timeline on Wikipedia that has all the relationships, it's interesting how related everything is.

https://upload.wikimedia.org/wikipedia/commons/2/22/RDBMS_ti...

Re:Citus Data Donates 1% of Equity to PostgreSQL Organizations by jve on Thursday October 25, 2018 @04:05AM (#18299284)
Woah, looks like PostgreSQL and MS SQL Server has same ancestor and started at the same time :)