TheLIMIToperator is used to get a limited number of tuples from a relation.

Syntax

Given below is the syntax of theLIMIToperator.

grunt
>
 Result = LIMIT Relation_name required number of tuples;

Example

Assume that we have a file namedstudent_details.txtin 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 Pig with the relation namestudent_detailsas 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’s sort the relation in descending order based on the age of the student and store it into another relation namedlimit_datausing theORDER BYoperator as shown below.

grunt
>
 limit_data 
=
 LIMIT student_details 
4
;

Verification

Verify the relationlimit_datausing theDUMPoperator as shown below.

grunt
>
Dump
 limit_data
;

Output

It will produce the following output, displaying the contents of the relationlimit_dataas follows.

(1,Rajiv,Reddy,21,9848022337,Hyderabad) 
(2,siddarth,Battacharya,22,9848022338,Kolkata) 
(3,Rajesh,Khanna,22,9848022339,Delhi) 
(4,Preethi,Agarwal,21,9848022330,Pune)