Cognizant Software Developer Interview Questions, Process, and Tips

Medium level questions. time will be sufficient. need not worry. easy to crack.

2 questions were asked. one is based on logic. other is based on hashmap in java. easy to crack

Q1. What is data warehousing
Ans. 
Data warehousing is the process of collecting, storing, and managing data from various sources for analysis and reporting.
• Data warehousing involves extracting data from multiple sources

• Data is transformed and loaded into a central repository

• Allows for complex queries and analysis to be performed on the data

• Data warehousing helps in decision-making and business intelligence

• Examples include Oracle Exadata, IBM Netezza, a
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Q2. What types of difficult situation you handle
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Q3. Difference between lookup and Joiner transformation
Ans. 
Lookup transformation is used to look up data in a flat file or relational table, while Joiner transformation is used to join data from two sources based on a common key.
• Lookup transformation is used to look up data in a flat file or relational table

• Joiner transformation is used to join data from two sources based on a common key

• Lookup transformation can be used for performing lookups on multiple columns, while Joiner ...read more
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Q1. Real time question
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Q2. Project related questions
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Q3. How to delete duplicate records
Ans. 
To delete duplicate records, use SQL queries with DISTINCT keyword or create a unique index on the table.
• Use SQL queries with DISTINCT keyword to select unique records and insert them into a new table

• Create a unique index on the table to prevent insertion of duplicate records

• Use programming languages like Python or Java to iterate through records and remove duplicates
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It was good ask to fetch tha api data

Q1. Core java advanced java devops
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Q2. Containerisation
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Q3. Oops related.Questions
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Q4. Rest api questions
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Q5. Database related questions
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Multithreading, Java 2

Q1. What is the difference between hashtable and hash map
Ans. 
Hashtable is synchronized and does not allow null keys, while hashmap is not synchronized and allows one null key.
• Hashtable is synchronized, while hashmap is not.

• Hashtable does not allow null keys, while hashmap allows one null key.

• Hashtable is thread-safe, while hashmap is not.

• Hashtable is slower than hashmap.

• Hashtable is part of the legacy collection classes, while hashmap is part of the Java Collections Framework.
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