Cognizant Analyst Interview Questions, Process, and Tips

Q1. What's SQL joins
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• SQL joins are used to retrieve data from multiple tables based on a related column between them

• Types of SQL joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
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Q1. HR - behavioral questions
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Medium level questions with game section

Communication round on online platform. Easy level

Q1. About language mentioned on my cv
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Q2. Project mentioned on your cv
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Q1. Diff b/w arraylist and linkedlist
Ans. 
ArrayList is resizable and uses contiguous memory while LinkedList uses nodes and is best for frequent insertions/deletions.
• ArrayList is faster for accessing elements by index

• LinkedList is faster for inserting/deleting elements in the middle of the list

• ArrayList uses less memory than LinkedList for storing the same number of elements

• LinkedList is better suited for implementing a stack or queue

• Example: ArrayList arrList...read more
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Q1. Spring boot related questions and previous project related discussions
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Q1. General package discussions
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The coding round consists of 3 Array based questions and 2 SQL based questions

Q1. The interview was based on SQL in depth.
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Q2. Difference between Delete and Truncate
Ans. 
Delete removes specific rows while Truncate removes all rows from a table.
• Delete is a DML operation while Truncate is a DDL operation.

• Delete can be rolled back while Truncate cannot be rolled back.

• Delete operation is slower than Truncate operation.

• Delete operation does not reset the identity of the table while Truncate does.

• Example: DELETE FROM table_name WHERE condition; TRUNCATE TABLE table_name;
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Q3. What is warehouse and its uses?
Ans. 
A warehouse is a large storage facility used to store goods and products for distribution or sale.
• Warehouses are used by manufacturers, wholesalers, retailers, and other businesses to store their products.

• They can be used for short-term or long-term storage, depending on the needs of the business.

• Warehouses can also be used for cross-docking, where products are quickly transferred from one truck to another for faster d...read more
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