feat: view vs materialized view

dump/postgres/view.md

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+## `View` vs `Materialized View`
+
+| View                                 | Materialized View                                                        |
+|--------------------------------------|--------------------------------------------------------------------------|
+| A view is a virtual table.           | A materialized view is a physical copy of the table, stored on the disk. |
+| "Updated" every time it is accessed. | "Updated" only via triggers or refresh command (manually).               |
+| Slow                                 | Fast, because it is precomputed.                                         |
+
+### Advantages of `View`
+
+- No storage space is required for a view.
+- Restrict users from accessing some columns.
+- Reducing complexity of queries.
+
+View = alias for user query.
+
+### Advantages of `Materialized View`
+
+- Faster than views, because it is precomputed.
+- Can be indexed.
+
+Materialized view = cached query result.
+
+### Resources
+
+- https://www.timescale.com/blog/how-postgresql-views-and-materialized-views-work-and-how-they-influenced-timescaledb-continuous-aggregates/