hive SQL操作

Hive 内部表

CREATE  TABLE [IF NOT EXISTS] table_name

删除表时，元数据与数据都会被删除
Hive 外部表

CREATE EXTERNAL TABLE [IF NOT EXISTS] table_name LOCATION hdfs_path

删除外部表只删除metastore的元数据，不删除hdfs中的表数据

 CREATE TABLE person(
    id INT,
    name STRING,
    age INT,
    likes ARRAY<STRING>,
    address MAP<STRING,STRING>
  )
  ROW FORMAT DELIMITED 
  FIELDS TERMINATED BY ',' 
  COLLECTION ITEMS TERMINATED BY '-'
  MAP KEYS TERMINATED BY ':' 
  LINES TERMINATED BY '\n';

Hive 查看表描述

DESCRIBE [EXTENDED|FORMATTED] table_name

Hive 建表

Create Table Like:
CREATE TABLE empty_key_value_store LIKE key_value_store;

Create Table As Select (CTAS)
CREATE TABLE new_key_value_store 
      AS
    SELECT columA, columB FROM key_value_store;
    ```