https://www.tutorialspoint.com/apache\_pig/apache\_pig\_group\_operator.htm

Given below is the syntax of the group operator.

grunt> Group_data = GROUP Relation_name BY age;

Example

Assume that we have a file named student_details.txt in the HDFS directory /pig_data/ as shown below.

student_details.txt

001,Rajiv,Reddy,21,9848022337,Hyderabad

002,siddarth,Battacharya,22,9848022338,Kolkata

003,Rajesh,Khanna,22,9848022339,Delhi

004,Preethi,Agarwal,21,9848022330,Pune

005,Trupthi,Mohanthy,23,9848022336,Bhuwaneshwar

006,Archana,Mishra,23,9848022335,Chennai

007,Komal,Nayak,24,9848022334,trivendram

008,Bharathi,Nambiayar,24,9848022333,Chennai

And we have loaded this file into Apache Pig with the relation name student_details as shown below.

grunt> student_details = LOAD 'hdfs://localhost:9000/pig_data/student_details.txt' USING PigStorage(',')

as (id:int, firstname:chararray, lastname:chararray, age:int, phone:chararray, city:chararray);

Now, let us group the records/tuples in the relation by age as shown below.

grunt> group_data = GROUP student_details by age;