NTT Data ETL Developer Interview Questions and Answers

Q1. Informtica with date functions
Ans. 
Informatica is a popular ETL tool used for data integration and transformation. It has built-in functions to handle date operations.
• Informatica is a powerful ETL tool used for extracting, transforming, and loading data.

• It provides a variety of built-in functions for handling date operations such as date calculations, formatting, and conversions.

• Examples of date functions in Informatica include TO_DATE, TO_CHAR, ADD_TO_
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Q1. Rank and dense rank
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Q2. Scenario based etl question
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Q1. Basic Question Answer
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Q2. Basic SQL , SNWOFLAKE AND ETL Concepts
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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. Some in depth questions about python and java
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Asked some problem solving questions they will allow to choose the language it's good

Q1. What is the uses of filter stage
Ans. 
Filter stage is used in ETL processes to selectively pass or reject data based on specified criteria.
• Filter stage helps in removing unwanted data from the input dataset.

• It can be used to apply conditions like filtering out duplicate records, selecting specific columns, or excluding certain values.

• For example, a filter stage can be used to only pass records where the sales amount is greater than $1000.
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Q2. What is the uses of transfor stage
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Transform stage is used in ETL process to apply business rules, clean and enrich data before loading into target database.
• Transform stage is used to apply business rules to the data.

• It is used to clean and standardize data before loading into the target database.

• Transform stage can also be used to enrich data by combining multiple sources or adding calculated fields.

• Examples include converting data types, removing dupl
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Q3. What is the uses of sort stage
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Sort stage is used in ETL processes to sort data based on specified criteria before loading it into the target system.
• Sort stage helps in arranging data in a specific order for better analysis and reporting

• It can be used to remove duplicates from data before loading

• Sorting can be done based on multiple columns or expressions

• Example: Sorting customer data based on their purchase amount before loading into a data warehou
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Q4. How to create the prallel job
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To create a parallel job, use parallel processing techniques to divide tasks into smaller subtasks that can be executed simultaneously.
• Identify tasks that can be executed independently and in parallel

• Use parallel processing techniques such as multi-threading or distributed computing

• Implement parallel job using ETL tools like Informatica or Talend

• Monitor and optimize parallel job performance to ensure efficient executio
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Q5. Defenation of scd
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SCD stands for Slowly Changing Dimension, a technique used in data warehousing to track changes in dimension attributes over time.
• SCD is used to maintain historical data in a data warehouse

• There are different types of SCDs - Type 1, Type 2, and Type 3

• Type 1 SCD overwrites old data with new data

• Type 2 SCD creates a new record for each change and maintains history

• Type 3 SCD keeps a limited history by adding columns to tr
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Q1. Basic questions based on Informatica power center
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Q1. Scenario based questions on Informatica power center
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Q1. Basic salary and other discussion
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Q1. Question on logic SCD types
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Q2. Dynamic lookup along with lookup
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