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Loading Data

Function

This topic describes how to use Hive Query Language (HQL) to load data to the existing employees_info table. You can learn how to load data from a local file system and MRS cluster. LOCAL is used to differentiate between local and non-local data sources.

Example Codes

-- Load the employee_info.txt file from the /opt/hive_examples_data/ directory of the local file system to the employees_info table.
---- Overwrite the original data using the new data
LOAD DATA LOCAL INPATH '/opt/hive_examples_data/employee_info.txt' OVERWRITE INTO TABLE employees_info; 
---- Retain the original data and add the new data to the table.
LOAD DATA LOCAL INPATH '/opt/hive_examples_data/employee_info.txt' INTO TABLE employees_info;
 
-- Load /user/hive_examples_data/employee_info.txt from HDFS to the employees_info table.
---- Overwrite the original data using the new data
LOAD DATA INPATH '/user/hive_examples_data/employee_info.txt' OVERWRITE INTO TABLE employees_info; 
---- Retain the original data and add the new data to the table.
LOAD DATA INPATH '/user/hive_examples_data/employee_info.txt' INTO TABLE employees_info;

Loading data is to copy data to a specified table in the Hadoop distributed file system (HDFS).

Extensions

None

Parent topic: Example Codes