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).

Sample Data

Data in employees_info is as follows:

1,Wang,R,8000.01,person&personal^Btype&income^Btax&0.05,Country1:City1,2014
3,Tom,D,12000.02,person&personal^Btype&income^Btax&0.09,Country2:City2,2014
4,Jack,D,24000.03,person&personal^Btype&income^Btax&0.05,Country3:City3,2014
6,Linda,D,36000.04,person&personal^Btype&income^Btax&0.05,Country4:City4,2014
8,Zhang,R,9000.05,person&personal^Btype&income^Btax&0.05,Country5:City5,2014

Data in employees_contact is as follows:

1,135 XXXX XXXX,xxxx@xx.com
3,159 XXXX XXXX,xxxxx@xx.com.cn
4,186 XXXX XXXX,xxxx@xx.org
6,189 XXXX XXXX,xxxx@xxx.cn
8,134 XXXX XXXX,xxxx@xxxx.cn

Data in employees_info_extended is as follows:

1,Wang,135 XXXX XXXX,xxxx@xx.com,R,8000.01,person&personal^Btype&income^Btax&0.05,Country1:City1,2014
3,Tom,159 XXXX XXXX,xxxxx@xx.com.cn,D,12000.02,person&personal^Btype&income^Btax&0.09,Country2:City2,2014
4,Jack,186 XXXX XXXX,xxxx@xx.org,D,24000.03,person&personal^Btype&income^Btax&0.05,Country3:City3,2014
6,Linda,189 XXXX XXXX,xxxx@xxx.cn,D,36000.04,person&personal^Btype&income^Btax&0.05,Country4:City4,2014
8,Zhang,134 XXXX XXXX,xxxx@xxxx.cn,R,9000.05,person&personal^Btype&income^Btax&0.05,Country5:City5,2014