hive create 怎样实现

Hive中的CREATE语句用于创建表、分区表、外部表等

1. 创建普通表：

CREATE TABLE table_name (column1 data_type,column2 data_type,...)ROW FORMAT DELIMITEDFIELDS TERMINATED BY 'delimiter'STORED AS file_format;

示例：

CREATE TABLE employees (id INT,name STRING,age INT)ROW FORMAT DELIMITEDFIELDS TERMINATED BY ','STORED AS TEXTFILE;

2. 创建分区表：

CREATE TABLE table_name (column1 data_type,column2 data_type,...)PARTITIONED BY (partition_column1 data_type, partition_column2 data_type, ...)ROW FORMAT DELIMITEDFIELDS TERMINATED BY 'delimiter'STORED AS file_format;

示例：

CREATE TABLE sales (order_id INT,product_id INT,customer_id INT,quantity INT,price FLOAT)PARTITIONED BY (order_date STRING)ROW FORMAT DELIMITEDFIELDS TERMINATED BY ','STORED AS TEXTFILE;

3. 创建外部表：

CREATE EXTERNAL TABLE table_name (column1 data_type,column2 data_type,...)ROW FORMAT DELIMITEDFIELDS TERMINATED BY 'delimiter'STORED AS file_formatLOCATION 'hdfs_path';

示例：

CREATE EXTERNAL TABLE customer_data (id INT,name STRING,age INT)ROW FORMAT DELIMITEDFIELDS TERMINATED BY ','STORED AS TEXTFILELOCATION 'hdfs://localhost:9000/user/customer_data';

请注意，这些示例中的data_type、delimiter和file_format需要根据实际需求进行替换。在实际使用中，还需要考虑Hive的元数据存储（通常是HDFS）的可用性和配置。