Views | HEAVY.AI Documentation

A view is a virtual table based on the result set of a SQL statement. It derives its fields from a SELECT statement. You can do anything with a HEAVY.AI view query that you can do in a non-view HEAVY.AI query.

Nomenclature Constraints

View object names must use the NAME format, described in regex notation as:

[A-Za-z_][A-Za-z0-9\$_]*

CREATE VIEW

Creates a view based on a SQL statement.

Example

1 CREATE VIEW view_movies
2 AS SELECT movies.movieId, movies.title, movies.genres, avg(ratings.rating)
3 FROM ratings
4 JOIN movies on ratings.movieId=movies.movieId
5 GROUP BY movies.title, movies.movieId, movies.genres;

You can describe the view as you would a table.

1 \d view_movies
2 VIEW defined AS: SELECT  movies.movieId, movies.title, movies.genres,
3 avg(ratings.rating) FROM ratings JOIN movies ON ratings.movieId=movies.movieId
4 GROUP BY movies.title, movies.movieId, movies.genres
5 Column types:
6     movieId INTEGER,
7     title TEXT ENCODING DICT(32),
8     genres TEXT ENCODING DICT(32),
9     EXPR$3 DOUBLE

You can query the view as you would a table.

1 SELECT title, EXPR$3 from view_movies where movieId=260;
2 Star Wars: Episode IV - A New Hope (1977)|4.048937

DROP VIEW

Removes a view created by the CREATE VIEW statement. The view definition is removed from the database schema, but no actual data in the underlying base tables is modified.

Example

1 DROP VIEW IF EXISTS v_reviews;