Spark SQL 指南

CREATE DATABASE

描述

创建具有指定名称的数据库。 如果已存在同名数据库，则将引发异常。

语法

CREATE { DATABASE | SCHEMA } [ IF NOT EXISTS ] database_name
    [ COMMENT database_comment ]
    [ LOCATION database_directory ]
    [ WITH DBPROPERTIES ( property_name = property_value [ , ... ] ) ]

参数

示例

-- Create database `customer_db`. This throws exception if database with name customer_db
-- already exists.
CREATE DATABASE customer_db;

-- Create database `customer_db` only if database with same name doesn't exist.
CREATE DATABASE IF NOT EXISTS customer_db;

-- Create database `customer_db` only if database with same name doesn't exist with 
-- `Comments`,`Specific Location` and `Database properties`.
CREATE DATABASE IF NOT EXISTS customer_db COMMENT 'This is customer database' LOCATION '/user'
    WITH DBPROPERTIES (ID=001, Name='John');

-- Verify that properties are set.
DESCRIBE DATABASE EXTENDED customer_db;
+-------------------------+--------------------------+
|database_description_item|database_description_value|
+-------------------------+--------------------------+
|            Database Name|               customer_db|
|              Description| This is customer database|
|                 Location|     hdfs://hacluster/user|
|               Properties|   ((ID,001), (Name,John))|
+-------------------------+--------------------------+