The actual data is stored in the original tables that were part of the query of the _VIEW_ creation. In the example above, that would be the `Employees` table. Imagine the _VIEW_ as a query saved for later use. In essence, that's just a convenience for the user, as the query to the _VIEW_ could be understood far easier than the original query.

However, the above isn't true for _MATERIALIZED VIEW_. Those are specialized versions of a _VIEW_, which cache the data from the creation query. 

```SQL
CREATE MATERIALIZED VIEW Employee_Summary_M AS
SELECT first_name, last_name, salary
FROM Employees;
```

In that case, the data is stored in two places. The original, actual data in the original tables (in our case `Employee` table). The interim, cached data is stored in the _MATERIALIZED VIEW_, until it gets invalidated. In PostgreSQL, you can invalidate that cache with _REFRESH MATERIALIZED VIEW_ query. Other databases have some variations on the functionality of the _MATERIALIZED VIEW_.

```SQL
REFRESH MATERIALIZED VIEW Employee_Summary_M;
```
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