CREATE VIEW

Description

This statement is used to create a logical view.

Syntax:

CREATE VIEW [IF NOT EXISTS]
[db_name.]view_name
(column1[ COMMENT "col comment"][, column2, ...])
AS query_stmt

Note:

1. The view is a logical view with no physical storage. All queries on the view are equivalent to subqueries corresponding to the view.
2. query_stmt is arbitrarily supported SQL.

Examples

1. Create view example_view on example_db.

   CREATE VIEW example_db.example_view (k1, k2, k3, v1)
   AS
   SELECT c1 as k1, k2, k3, SUM(v1) FROM example_table
   WHERE k1 = 20160112 GROUP BY k1,k2,k3;

2. Create a view containing comment.

   CREATE VIEW example_db.example_view
   (
   k1 COMMENT "first key",
   k2 COMMENT "second key",
   k3 COMMENT "third key",
   v1 COMMENT "first value"
   )
   COMMENT "my first view"
   AS
   SELECT c1 as k1, k2, k3, SUM(v1) FROM example_table
   WHERE k1 = 20160112 GROUP BY k1,k2,k3;