Fggh ETL Developer Interview Questions and Answers

Q1. Lookup ,router,joiner
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Q2. Different types of caches
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Q3. Scd1 and scd2 implementation
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Q4. Fact and dimensions tables and different data modelling
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Q1. Salary discuss and location discussion
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Q1. Explainyour job role
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ETL Developers are responsible for designing, developing, and maintaining ETL processes to extract, transform, and load data from various sources into a data warehouse.
• Designing ETL processes to extract data from multiple sources

• Transforming data to meet business requirements

• Loading data into a data warehouse or other target systems

• Developing and maintaining ETL jobs using tools like Informatica, Talend, or SSIS
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Q2. Explain implementation of SCD 1 in IICS
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SCD Type 1 in IICS involves overwriting existing data with new data without maintaining historical changes.
• In IICS, use the Mapping Designer to create a mapping that loads data from source to target.

• Use a Lookup transformation to check if the record already exists in the target table.

• If the record exists, update the existing record with new data using an Update Strategy transformation.

• If the record does not exist, inse...read more
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Q1. What is loads in informatica
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Loads in Informatica refer to the process of moving data from source to target in a data warehouse.
• Loads involve extracting data from source systems

• Transforming the data as needed

• Loading the data into the target data warehouse or database

• Loads can be full, incremental, or delta depending on the requirements

• Example: Loading customer data from a CRM system into a data warehouse for analysis
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Q2. Query to find duplicates in table
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Use GROUP BY and HAVING clause to find duplicates in a table.
• Use GROUP BY to group rows with same values together

• Use HAVING COUNT(*) > 1 to filter out duplicates

• Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;
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Q1. Introduce yourself
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I am an experienced ETL Developer with a strong background in data integration and transformation.
• Over 5 years of experience in ETL development

• Proficient in using tools like Informatica, Talend, and SSIS

• Strong SQL skills for data querying and manipulation

• Experience in designing and implementing data warehouses

• Familiar with data modeling and ETL best practices
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Q2. What is SCD type2
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Q1. Rank and dense rank
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Q2. Scenario based etl question
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Q1. Informatica powercenter architecture, scd1, scd2 etc
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Q2. Lookups and where to use them
Ans. 
Lookups are used to retrieve related data from another table based on a common key.
• Lookups are used in ETL processes to enrich data by adding additional information from a reference table.

• They are commonly used to replace codes with corresponding descriptions, such as replacing product IDs with product names.

• Lookups can be performed using SQL joins or lookup transformations in ETL tools like Informatica or Talend.
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Q1. Informatica scenarios and theoretical questions
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Q1. Project related questions
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Q1. Basic discussion in HR
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It's an assignment for apti, verbal

Q1. It's like an what are u mentioned in resume skills.
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Q1. Just like interaction with candidate like personal details.
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