CyberArk Senior Data Scientist Interview Questions and Answers

Yes, aggregate functions can be used with HAVING and WHERE clauses. WHERE filters rows before grouping, HAVING filters groups after grouping.

• Aggregate functions can be used with HAVING clause to filter groups based on the result of the aggregate function.

• Aggregate functions can also be used with WHERE clause to filter rows before grouping.

• WHERE clause filters rows before grouping, while HAVING clause filters groups aft...read more

The order of execution of a SQL query is: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY.

• FROM: Specifies the tables involved in the query

• WHERE: Filters the rows based on specified conditions

• GROUP BY: Groups the rows that have the same values into summary rows

• HAVING: Filters the groups based on specified conditions

• SELECT: Selects the columns to be displayed in the result set

• ORDER BY: Sorts the result set based on speci

User Defined Functions, Stored Procedures, and Triggers are database objects used to perform specific tasks in database management systems.

• User Defined Functions are custom functions created by users to perform specific calculations or operations in a database.

• Stored Procedures are precompiled SQL statements that can be executed by calling the procedure name.

• Triggers are special types of stored procedures that are auto...read more

GCD is a low-level API for managing concurrent operations, while Queue is a high-level API for managing tasks in a FIFO order.

• GCD stands for Grand Central Dispatch and is a low-level API for managing concurrent operations in iOS and macOS.

• Queues are a high-level API in GCD used for managing tasks in a FIFO (First In, First Out) order.

• GCD allows you to create and manage queues, while queues are used to execute tasks con...read more

To check if a number is a power of 2, we can use bitwise operations.

• A power of 2 has only one bit set to 1, so we can use the bitwise AND operator to check if the number is a power of 2.

• If n is a power of 2, then n & (n-1) will be 0.

• For example, 8 (1000 in binary) is a power of 2, and 8 & 7 (0111 in binary) is 0.

Sort a stack without using another data structure

• Use recursion to pop the top element and insert it at the bottom of the remaining stack

• Repeat until the stack is sorted in ascending order

• Time complexity: O(n^2), space complexity: O(n) due to recursion

Check if array has continuous increasing and decreasing values

• Loop through the array and check if each element is greater than the previous one

• Once you find the maximum element, check if the remaining elements are in decreasing order

• If yes, return true else false

Design a cricinfo (LLD)

• Identify the entities: players, teams, matches, scorecards, tournaments, etc.

• Define the relationships between entities

• Create a database schema to store the data

• Implement APIs to fetch and update data

• Design a UI to display the information

• Consider scalability and performance

• Ensure data security and privacy

Python has various datatypes like int, float, str, list, tuple, dict, set, bool.

• int: whole numbers

• float: decimal numbers

• str: text

• list: ordered collection

• tuple: ordered, immutable collection

• dict: key-value pairs

• set: unordered collection with no duplicates

• bool: True or False values

Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. Flask is a lightweight WSGI web application framework.

• Django is a full-featured framework with built-in ORM, admin panel, and authentication system.

• Flask is a microframework that is more lightweight and flexible, allowing developers to choose their own tools and libraries.

• Django follows the 'batteries included' ph...read more