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Views

Views are virtual collections defined by SQL queries. A view’s SQL query can reference other views, collections, aliases, or it may not reference anything. For example, SELECT 1 does not reference anything, but is still a valid query for a view.

A few examples of views are:

  • A view that selects a specific subset of columns from a collection.
  • A view that joins multiple collections into a single virtual table.

A view does not store any data and thus is also known as a non-materialized view. Whenever a view is queried, we execute the query that defines it.

#Why Views?

#Convenience and Modularity

Views are useful for writing modular SQL. You can replace your CTEs with views and break large, unwieldy queries into manageable chunks.

#Scoped Data Access

You can create views that provide a subset of columns or documents from a collection. With custom roles, you can then allow users to access that view without accessing the underlying collection(s).

You can use this mechanism to provide several views on the same underlying collection for different teams or roles without any data duplication.

#Collaboration

Like Query Lambdas, you can use views to share particular data views and SQL snippets. Views, unlike Query Lambdas, are queryable themselves and thus are better suited for sharing in many cases.

Once you save your SQL as a view, anyone else with access to that view can use it as a data source for new views and Query Lambdas.

#Creating Views

Views can be created and updated from the Query tab of the Rockset Console.

Create View

You can find existing views in the Collections tab as well.

Views

You can also manage Views programmatically using the Rockset API.

Note: Updating a view is an asynchronous operation that can take one to two seconds. During this window the view will continue to function with the previous SQL definition. This is usually relevant if you are writing a script that changes a view definition and then immediately queries it.

#Querying Views

Like aliases, views should be treated in the same manner as any standard collection in your SQL queries. Similar to collections, each view exists in a workspace and can be queried by joining its workspace and name using a dot (.) character in your SQL queries (e.g., commons.myView). You can join them with other collections and views or use them in Query Lambdas.