ETL Talend Developer Interview Questions and Answers for Freshers

Filter source data by department id and store in unique files

• Use Talend components like tFilterRow to filter data based on department id

• Create a unique file for each department using tFileOutputDelimited component

• Loop through all department ids to process data for each department

Optimizing SQL queries can improve query performance by using indexes, avoiding unnecessary joins, and optimizing the query structure.

• Use indexes on columns frequently used in WHERE clauses

• Avoid using SELECT * and only retrieve necessary columns

• Optimize joins by using INNER JOIN instead of OUTER JOIN when possible

• Use WHERE clause to filter data early in the query

• Avoid using functions in WHERE clauses as they can prevent index usage