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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