Load previous day data as a start data for the next day in Talend

[Anonymous]

Hi Team,

I am trying to design a job which will capture Daily power readings. The input file contains data of the daily readings for different power reading meters. The readings of the output have to be updated as the start data and end data .The readings of the previous day reading of a meter should be loaded as start date for that meter for the next day. and the readings will be loaded directly as end data

ie 

INPUT
Meter_Name	Date	readings
A	20/10/2019	100
B	20/10/2019	150
A	21/10/2019	300
B	21/10/2019	250

the expected output is 

Meter_Name	Date	Start Data	End Data
A	20/10/2019		100
B	20/10/2019		150
A	21/10/2019	100	300
B	21/10/2019	150	250

Please suggest a method to implement this logic in Talend  job.

[Anonymous · Accepted solution]

Hi,

    Its very easy with Talend. Please refer the below screenshots.

You need to read the same file twice for main and lookup flow. In the lookup join condition, you need to join based on meter name and date -1. The function for date -1 is as shown below.

TalendDate.addDate(row1.reading_date,-1,"DD") 

Warm Regards,
Nikhil Thampi

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[Anonymous]

Thanks @nthampi . It worked for me.