CREATE VIEW

description

该语句用于创建一个逻辑视图

语法:

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

说明:

  1. 视图为逻辑视图,没有物理存储。所有在视图上的查询相当于在视图对应的子查询上进行。

  2. query_stmt 为任意支持的 SQL

Example

  1. 在 example_db 上创建视图 example_view

    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. 创建一个包含 comment 的 view

    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;

keyword

CREATE,VIEW