> The point was about doing more work using the SQL DB engine
The specific reference was to “psql script”, which runs in the psql client program, not the DB engine. Since I suspected that might be an error intending to reference SQL running on the server, I separately addressed, in my initial response, both what was literally said (psql script) and sql running in the DB.
Any psql script would be building and running SQL queries so I fail to see how that has any impact of the point being made.
Edit: The argument is that there are operations that should be done in the SQL layer and it is worth time learning enough about that layer to understand when and how to use it for computation. Once you learn that, it isn't really relevant if you are using psql or some other client library to build those queries.
