CREATE-VIEW

Name

CREATE VIEW

Description

This statement is used to create a logical view grammar:

1. CREATE VIEW [IF NOT EXISTS]
2. [db_name.]view_name
3. (column1[ COMMENT "col comment"][, column2, ...])
4. 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

1. CREATE VIEW example_db.example_view (k1, k2, k3, v1) 2. AS 3. SELECT c1 as k1, k2, k3, SUM(v1) FROM example_table 4. WHERE k1 = 20160112 GROUP BY k1,k2,k3; 2. Create a view with a comment

1. CREATE VIEW example_db.example_view 2. ( 3. k1 COMMENT "first key", 4. k2 COMMENT "second key", 5. k3 COMMENT "third key", 6. v1 COMMENT "first value" 7. ) 8. COMMENT "my first view" 9. AS 10. SELECT c1 as k1, k2, k3, SUM(v1) FROM example_table 11. WHERE k1 = 20160112 GROUP BY k1,k2,k3;

Keywords

1. CREATE, VIEW

Best Practice