Protechsoft Technologies Interview Questions and Answers

To find the 3rd maximum salary, we can use SQL queries to filter and sort salary data effectively.

• Use the DISTINCT keyword to avoid duplicate salaries: SELECT DISTINCT salary FROM employees.

• Sort the salaries in descending order: SELECT DISTINCT salary FROM employees ORDER BY salary DESC.

• Use LIMIT or FETCH to get the 3rd salary: SELECT DISTINCT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 2.

Program to generate Fibonacci series

• Start with two variables initialized to 0 and 1

• Loop through desired number of terms and calculate next term by adding previous two terms

• Store each term in an array

• Return the array of Fibonacci series

let is block-scoped while var is function-scoped.

• let variables are only accessible within the block they are declared in

• var variables are accessible within the entire function they are declared in

• let variables can be reassigned but not redeclared

• var variables can be both reassigned and redeclared

• let variables are a safer option for avoiding variable hoisting issues

The 'this' operator refers to the object that is currently executing the code.

• The value of 'this' depends on how a function is called.

• In a method, 'this' refers to the object that owns the method.

• In a regular function, 'this' refers to the global object (window in a browser).

• In an event handler, 'this' refers to the element that received the event.

• The value of 'this' can be explicitly set using call(), apply(), or...read more

Agile and waterfall models are two different approaches to software development.

• Agile is an iterative and flexible approach, while waterfall is a sequential and rigid approach.

• Agile focuses on delivering working software in short iterations, while waterfall follows a linear process.

• Agile encourages collaboration and adaptability, while waterfall emphasizes planning and documentation.

• Agile allows for changes and fe...read more

Smoke testing is a subset of sanity testing. Smoke testing verifies basic functionality, while sanity testing checks for major issues.

• Smoke testing is performed to ensure that the critical functionalities of the software are working fine after a build.

• Sanity testing is performed to check if the major functionalities of the software are working as expected after a minor change or bug fix.

• Smoke testing is a subset o...read more