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Crest Infosystems
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I applied via Naukri.com and was interviewed before Sep 2022. There were 2 interview rounds.
Polymorphism in OOPs allows objects of different classes to be treated as objects of a common superclass.
Polymorphism allows methods to be called on objects of different classes that implement the same interface or superclass.
There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).
Example: Animal superclass with methods like eat() and sleep(). Dog and Cat subclasses can ov...
MySQL injections are a type of cyber attack where malicious SQL statements are inserted into an entry field for execution.
MySQL injections occur when an attacker inserts malicious SQL code into a query to manipulate the database.
Attackers can use MySQL injections to access, modify, or delete data in the database.
Preventing MySQL injections involves using parameterized queries and input validation.
Example: SELECT * FROM...
Migration in Laravel is the process of managing database schema changes using PHP code.
Migration allows developers to define database tables and their structure using PHP code instead of SQL.
It helps in version control of database schema changes and makes it easier to collaborate with other developers.
Migrations can be rolled back to previous states if needed, making database changes reversible.
Example: 'php artisan ma...
I have integrated payment gateways like PayPal, Stripe, and Square into e-commerce websites.
Integrated PayPal payment gateway for seamless checkout process
Implemented Stripe API for secure credit card transactions
Configured Square payment gateway for in-person and online payments
Top trending discussions
posted on 12 Jul 2024
I applied via Referral and was interviewed before Jul 2023. There were 2 interview rounds.
Simple questions related to arraylist and queue
posted on 22 Jul 2024
There were 125 questions in the first round in which they asked questions about English grammar and easy questions about general behavior in 75 minutes
I applied via Campus Placement and was interviewed in Mar 2021. There were 4 interview rounds.
posted on 28 Jul 2021
I applied via Campus Placement and was interviewed before Jul 2020. There was 1 interview round.
Check if binary tree is balanced or not.
A balanced binary tree has the height of left and right subtrees differ by at most 1.
Recursively check the height of left and right subtrees and compare.
Use a helper function to calculate the height of a subtree.
Time complexity: O(nlogn) for a balanced tree, O(n^2) for a skewed tree.
Detect loops in a linked list.
Use two pointers, one moving at a faster pace than the other.
If there is a loop, the faster pointer will eventually catch up to the slower one.
To detect the start of the loop, reset one pointer to the head and move both pointers at the same pace.
I applied via Company Website and was interviewed in Jul 2021. There was 1 interview round.
Complex SQL scenarios and their results
Using subqueries to filter data
Joining multiple tables with complex conditions
Using window functions to calculate running totals
Pivoting data to transform rows into columns
Using recursive queries to traverse hierarchical data
I applied via Walk-in and was interviewed before Mar 2021. There were 3 interview rounds.
Aptitude test
Current affairs
posted on 15 Jul 2022
I applied via Referral and was interviewed before Jul 2021. There were 3 interview rounds.
If you are a fresher , then this is for you else almost no coding test for experienced candidates.
posted on 10 May 2020
I applied via Recruitment Consultant and was interviewed in Apr 2020. There were 4 interview rounds.
I applied via Naukri.com and was interviewed before Apr 2021. There were 2 interview rounds.
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