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Indexes in MySQL are used to improve query performance by allowing faster data retrieval.
Indexes are created on one or more columns of a table.
They work by creating a separate data structure that allows for faster data retrieval.
Indexes can be created using the CREATE INDEX statement.
Indexes can also be dropped using the DROP INDEX statement.
Indexes can be used to speed up SELECT, UPDATE, and DELETE statements.
Indexes ...
include_once and require_once are PHP functions used to include files. The difference is in how they handle errors.
include_once will only include the file once, and will not throw a fatal error if the file is not found
require_once will also only include the file once, but will throw a fatal error if the file is not found
Both functions are used to include files that contain functions or variables that are needed in the
Sessions and cookies are both used for maintaining user state, but sessions are server-side and cookies are client-side.
Sessions store user data on the server, while cookies store data on the client's browser
Sessions are more secure than cookies because the data is not accessible to the client
Cookies can be used for tracking user behavior and preferences
Sessions are typically used for authentication and authorization p...
To find missing number in an array of first n numbers.
Calculate the sum of first n numbers using formula n*(n+1)/2
Calculate the sum of given array using loop
Subtract the sum of array from sum of first n numbers to get the missing number
Design a database schema for a chat application with individual and group messaging.
Create a 'users' table with unique user IDs
Create a 'messages' table with message IDs, sender and receiver IDs, message content, and timestamp
Create a 'groups' table with unique group IDs and group names
Create a 'group_members' table with group ID and user ID to track group membership
Use foreign keys to link tables together
Consider inde
SQL query to retrieve all unread messages upon user sign in
Use a JOIN statement to combine the messages and user tables
Filter the results to only show messages that have not been read by the user
Use the user's sign in information to identify which messages are unread
I am excited to join OLX because of its innovative approach to online marketplaces and its commitment to customer satisfaction.
I am impressed by OLX's user-friendly platform and its ability to connect buyers and sellers from all over the world.
I am excited to work with a team of talented developers who are passionate about creating cutting-edge technology.
I believe that OLX's focus on customer satisfaction aligns with ...
I have faced difficulties in debugging complex code and managing project timelines.
Debugging complex code with multiple dependencies
Managing project timelines with changing requirements
Working with legacy code and outdated technologies
Collaborating with team members in different time zones
Dealing with unexpected bugs and errors
I report to the Technical Lead and am part of the development team.
I report to the Technical Lead
I am part of the development team
Our website receives an average of 10,000 unique visitors per day.
Our website has a steady flow of traffic with a consistent number of unique visitors per day.
We use Google Analytics to track our web traffic and analyze user behavior.
Our peak traffic times are during weekdays from 9am to 5pm.
We have noticed an increase in mobile traffic over the past year.
Our website's traffic is primarily driven by organic search and
I applied via Campus Placement and was interviewed in Sep 2024. There were 2 interview rounds.
The question is asking for a variation of sorting an array containing 0s, 1s, and 2s.
Use a three-way partitioning algorithm to sort the array in a single pass.
Keep track of three pointers - low, mid, and high to partition the array.
Example: Input array = [0, 1, 2, 1, 0], Output array = [0, 0, 1, 1, 2]
A palindromic substring is a string that reads the same forwards and backwards.
Use dynamic programming to find the longest palindromic substring.
Start by considering each character as the center of a potential palindrome.
Expand outwards from each center to check for palindromic substrings.
Keep track of the longest palindrome found so far.
Example: Input 'babad', Output 'bab' or 'aba'.
I applied via Recruitment Consulltant and was interviewed in Nov 2024. There was 1 interview round.
Rank assigns unique ranks to each distinct value, while Dense Rank assigns consecutive ranks to each distinct value.
Rank does not skip ranks when there are ties, while Dense Rank does
Rank will have gaps in ranks if there are ties, while Dense Rank will not
Rank function is used to assign a unique rank to each distinct row, while Dense Rank function is used to assign consecutive ranks to each distinct row
I have 5 years of experience working in the automotive industry, specifically in dealer management roles.
Managed relationships with dealers to drive sales and increase profitability
Implemented strategies to improve dealer performance and customer satisfaction
Trained dealers on new products and services to enhance their sales capabilities
I used to sell kits for various purposes.
I sold kits for automotive maintenance, first aid, home improvement, etc.
I had experience selling kits with different components and price points.
I focused on understanding customer needs and recommending the right kit for them.
OLX interview questions for popular designations
Get interview-ready with Top OLX Interview Questions
I applied via Company Website and was interviewed in Apr 2024. There was 1 interview round.
My favorite product is the iPhone. Metrics I would track include user engagement, retention rate, customer satisfaction, and revenue growth.
User engagement: tracking daily active users, time spent on the device, and frequency of app usage.
Retention rate: monitoring how many users continue to use the product over time.
Customer satisfaction: collecting feedback through surveys, reviews, and customer support interactions.
...
I applied via LinkedIn and was interviewed in Jun 2023. There were 4 interview rounds.
I applied via LinkedIn and was interviewed in Oct 2023. There were 2 interview rounds.
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The duration of OLX interview process can vary, but typically it takes about less than 2 weeks to complete.
based on 36 interviews
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Dealer Success Manager
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Accounts Manager
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Senior Accounts Manager
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Retail Associate
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