[flas9sd]

Thanks for pointing me to "Postgres before SQL" - the history page at postgresql.org has links to the initial documents - QUEL is like a hint of an alternative universe. I think it is time to pick up a book by Michael Stonebraker.

[ezequiel-garzon]

And thank you in turn for the reference. It does indeed sound very interesting [1]. I had never heard of QUEL either [2].

[1] https://www.postgresql.org/docs/8.4/history.html

[2] https://en.wikipedia.org/wiki/QUEL_query_languages