CREATE-VIEW

CREATE-VIEW

Name

CREATE VIEW

Description

This statement is used to create a logical view grammar:

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

illustrate:

• Views are logical views and have no physical storage. All queries on the view are equivalent to the sub-queries corresponding to the view.
• query_stmt is any supported SQL

Example

1. Create the 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 with a 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;

Keywords

CREATE, VIEW

Best Practice