Ecom Express Interview Questions and Answers

Authentication is verifying identity, authorization is granting access. Form validation ensures data is entered correctly.

• Authentication confirms the identity of a user, while authorization determines what actions they can perform.

• Authentication can be implemented through methods like passwords, biometrics, or two-factor authentication.

• Authorization can be implemented through role-based access control or attribute-based access control.

• Form validation can be applied using Java...read more

SDLC is a process followed for software development. Waterfall model is a linear sequential approach to SDLC.

• SDLC stands for Software Development Life Cycle

• It is a process followed for software development from conception to deployment

• Waterfall model is a linear sequential approach to SDLC

• It consists of distinct phases such as planning, design, development, testing, and deployment

• Each phase must be completed before moving on to the next

• Agile model is an iterative approach to ...read more

To reverse a linked list, traverse the list and change the direction of pointers. To reverse a string, use built-in functions or loop through the string and swap characters.

• For reversing a linked list, use three pointers - prev, current, and next. Traverse the list and change the direction of pointers.

• For reversing a string, use built-in functions like reverse() or loop through the string and swap characters using two pointers - one at the beginning and one at the end.

• Example...read more

Query to find second highest salary in a table

• Use ORDER BY and LIMIT to select the second highest salary

• Assume the table name is 'employees' and salary column name is 'salary'

• SELECT salary FROM employees ORDER BY salary DESC LIMIT 1,1

Indexing is a way of organizing data for faster retrieval. There are different types of indexing.

• Indexing is the process of creating an index for a database table or a column in a table.

• It helps in faster retrieval of data by creating a pointer to the location of the data.

• Types of indexing include primary, secondary, clustered, non-clustered, bitmap, and full-text indexing.

• Primary indexing is based on the primary key of a table, while secondary indexing is based on non-primar...read more

Program to traverse a linked list using recursion

• Create a function that takes the head of the linked list as input

• Base case: if the current node is null, return

• Recursive case: print the data of the current node and call the function with the next node

• Call the function with the head of the linked list as input