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What is DaysBetween() Function?

  • The DaysBetween function subtracts the FromDate from the ToDate, returning the number whole day difference.
  • The time value of each date is taken account of - only whole 24 hour chunks are counted as whole days.
 days between in apache pig

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DaysBetween() function in Apache Pig

  • This function accepts two date-time objects and calculates the number of days between the two given date-time objects.

Syntax

grunt> DaysBetween(datetime1, datetime2)

Example

  • Ensure that we have a file named wikitechy_doj_dob.txt in the HDFS directory /pig_data/.
  • This file contains the date-of-birth and date-of-joining details of a particular person, id, dateof-birth, and date-of-join as given below.

wikitechy_doj_dob.txt

001,26/09/1989 09:00:00,16/01/2015 09:00:00
002,20/06/1980 10:22:00,10/08/2011 09:00:00
003,19/12/1990 03:11:44,25/10/2012 09:00:00 
  • We have loaded this file into Pig with a relation named doj_dob_data as given below.
doj_dob_data = LOAD 'hdfs://localhost:9000/pig_data/wikitechy_doj_dob.txt' USING PigStorage(',')
   as (id:int, dob:chararray, doj:chararray);
  • Now you can calculate the number of days between date-of-birth and date-of-join of the employees using the DaysBetween() function.
grunt> daysbetween_data = foreach doj_dob_data generate DaysBetween(ToDate(doj,'dd/MM/yyyy HH:mm:ss'),
   ToDate(dob,'dd/MM/yyyy HH:mm:ss'));

Verification

Verify the contents of the relation using the Dump operator as given below.

grunt> Dump daysbetween_data;

Output

  • The above statement stores the result in the relation named daysbetween_data.
(9243)
(11372)
(7981) 

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