DataNutts IT Solutions ETL Developer Interview Questions, Process, and Tips

Q1. Explain ETL process ?
Ans. 
ETL process involves extracting data from various sources, transforming it to fit business needs, and loading it into a target database.
• Extract data from multiple sources such as databases, files, APIs, etc.

• Transform the data by cleaning, filtering, aggregating, and converting it to the desired format.

• Load the transformed data into a target database or data warehouse.

• ETL tools like Informatica, Talend, and SSIS are com
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Q2. Explain Joins ?
Ans. 
Joins are used to combine rows from two or more tables based on a related column between them.
• Joins are used in SQL to retrieve data from multiple tables based on a related column.

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RI...read more
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Q3. What is DTM error ?
Ans. 
DTM error stands for Data Transformation Manager error, which occurs during the ETL process when there is an issue with data transformation.
• DTM error occurs during the ETL process when there is a problem with data transformation

• It can be caused by incorrect mapping of data fields, data type mismatches, or data quality issues

• DTM errors can lead to data loss, data corruption, or failed ETL processes

• Examples of DTM errors...read more
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Q4. Explain Workflow?
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Workflow is a series of tasks that need to be completed in a specific order to achieve a desired outcome.
• Workflow involves defining the sequence of steps needed to complete a task or project.

• It helps in organizing and coordinating tasks among team members.

• Workflow can be automated using tools like ETL software to streamline processes.

• Example: In ETL development, a workflow may include extracting data from a source, tra...read more
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Challanges in migration project

Q1. About you self ?
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