Out of curiosity, is there anything to this pairing of languages with databases presented in the link below? Does each database have its own optimal programming language?
Generally not; though there are some exceptions given the maturity level of the database drivers in any given language. For the most part though, any well-supported programming language should have a mature driver for any well-supported database.
The pairing on Gandi's offer has more to do with which database programmers of a given language are usually more familiar with. Hopefully you can use pgSQL in all three cases :-)
https://www.gandi.net/hosting/simple