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Read the whole textbook, MATERIALIZED VIEW requires a REFRESH that is outside the transaction that made the change: https://www.postgresql.org/docs/current/rules-materializedvi...

Postgres is not every system. Just because it requires manually refreshing matviews doesn't mean that every DBMS works that way.

Seriously, read a textbook:

Indeed, I jumped into PostgreSQL documentation, that's where I started reading about materialized views.

I do not think that PDF is worth taking space in my personal knowledge base. Thanks for sharing.