NEW ANUCOOL ENGINEERS Interview Questions and Answers

Postgresql and DB2 differences, transaction management by Hibernate, and indexes

• Postgresql is open-source, while DB2 is a commercial database

• Postgresql supports JSON data type, while DB2 does not

• Hibernate provides transaction management for both databases

• Indexes in Postgresql can be created using CREATE INDEX statement

• Indexes in DB2 can be created using CREATE INDEX or ALTER TABLE ADD INDEX statement

Binary search and Merge sort are common algorithms used for searching and sorting arrays.

• Binary search is a divide and conquer algorithm that searches for a target value within a sorted array.

• Merge sort is a divide and conquer algorithm that recursively divides the array into two halves, sorts them, and then merges them back together.

• Binary search has a time complexity of O(log n) while Merge sort has a time complexity of O(n log n).

Separate even and odd elements on either side of array

• Iterate through the array and separate even and odd elements into two separate arrays

• Merge the two arrays back together with even elements on one side and odd elements on the other

• Ensure to maintain the original order of elements in the array

Listen actively, empathize, stay calm, apologize, offer solutions, follow up.

• Listen actively to understand their concerns.

• Empathize with their situation and show understanding.

• Stay calm and composed, do not take their anger personally.

• Apologize for any inconvenience caused, even if it's not your fault.

• Offer solutions or alternatives to address their issue.

• Follow up to ensure the problem has been resolved to their satisfaction.

REST APIs are used to perform CRUD operations on resources using standard HTTP methods like GET, POST, PUT, DELETE.

• GET - Retrieve data from a server

• POST - Create new data on a server

• PUT - Update existing data on a server

• DELETE - Remove data from a server