Development Consultant Interview Questions and Answers

This program reverses a sentence by splitting it into words and then reversing the order of the words.

• Split the sentence into an array of words using a space as the delimiter

• Create an empty array to store the reversed words

• Iterate through the array of words in reverse order and add each word to the new array

• Join the reversed words array into a single string using a space as the delimiter

Telecom background involves designing, implementing and maintaining communication networks.

• Designing and implementing communication networks

• Maintaining and upgrading existing networks

• Ensuring network security and reliability

• Managing network resources and optimizing performance

• Providing technical support to customers

• Examples: 4G/5G networks, fiber optic cables, satellite communication systems

To find the second highest salary in a table, use the SQL query with the MAX function and a subquery.

• Use the MAX function to find the highest salary in the table

• Use a subquery to exclude the highest salary and find the maximum of the remaining salaries

• Combine the two queries to get the second highest salary

Implementing SCD type2 in Spark code

• Use DataFrame operations to handle SCD type2 changes

• Create a new column to track historical changes

• Use window functions to identify the latest record for each key

• Update existing records with end dates and insert new records with start dates