Contents
How do you update a materialized view in PostgreSQL?
REFRESH MATERIALIZED VIEW
- Name. REFRESH MATERIALIZED VIEW — replace the contents of a materialized view.
- Synopsis. REFRESH MATERIALIZED VIEW name [ WITH [ NO ] DATA ]
- Description. REFRESH MATERIALIZED VIEW completely replaces the contents of a materialized view.
- Parameters. name.
- Notes.
- Examples.
- Compatibility.
- See Also.
How do you insert into a view?
You can insert rows into a view only if the view is modifiable and contains no derived columns. The reason for the second restriction is that an inserted row must provide values for all columns, but the database server cannot tell how to distribute an inserted value through an expression.
What happens to the REFRESH MATERIALIZED VIEW in PostgreSQL?
If WITH NO DATA is specified no new data is generated and the materialized view is left in an unscannable state. The name (optionally schema-qualified) of the materialized view to refresh. While the default index for future CLUSTER operations is retained, REFRESH MATERIALIZED VIEW does not order the generated rows based on this property.
What is the name of the REFRESH MATERIALIZED VIEW?
The name (optionally schema-qualified) of the materialized view to refresh. While the default index for future CLUSTER operations is retained, REFRESH MATERIALIZED VIEW does not order the generated rows based on this property. If you want the data to be ordered upon generation, you must use an ORDER BY clause in the backing query.
When is data returned from a materialized view?
When a materialized view is referenced in a query, the data is returned directly from the materialized view, like from a table; the rule is only used for populating the materialized view.
Which is faster a materialized view or a view?
While access to the data stored in a materialized view is often much faster than accessing the underlying tables directly or through a view, the data is not always current; yet sometimes current data is not needed. Consider a table which records sales: