CREATE-VIEW

CREATE-VIEW

Name

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：

• 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。
• 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;

Keywords

CREATE, VIEW

Best Practice