Celebal Technologies Interview Questions, Process, and Tips

Q1. What are advance types of join ?
Ans. 
Advanced types of join include outer join, self join, and cross join.
• Outer join: includes unmatched rows from one or both tables

• Self join: joins a table with itself

• Cross join: combines each row from one table with each row from another table
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Q2. Difference between having clause and where clause?
Ans. 
The WHERE clause is used to filter rows before grouping, while the HAVING clause is used to filter groups after grouping.
• WHERE clause is used with SELECT, UPDATE, and DELETE statements.

• HAVING clause is used with SELECT statements that include GROUP BY clause.

• WHERE clause filters individual rows based on conditions.

• HAVING clause filters groups based on conditions.

• WHERE clause is applied before the GROUP BY clause.

• HAVING...read more
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Q3. Differnce between join and union?
Ans. 
Join combines rows from two or more tables based on a related column, while union combines rows from two or more tables into a single result set.
• Join is used to combine rows from different tables based on a related column.

• Union is used to combine rows from two or more tables into a single result set.

• Join can be used with different types like inner join, left join, right join, etc.

• Union only combines rows with the same ...read more
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Q4. Basic oops concept ?
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Q5. What are python data structure?
Ans. 
Python data structures are containers that hold and organize data in different ways.
• Some common Python data structures are lists, tuples, sets, and dictionaries.

• Lists are ordered and mutable, allowing duplicate elements.

• Tuples are ordered and immutable, useful for storing related data together.

• Sets are unordered and contain unique elements, useful for mathematical operations.

• Dictionaries are key-value pairs, providing
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Q1. Tell me something about yourself
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Q2. Would you be able to commute to jaipur
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Aptitude questions and normal maths, logical questions

3 coding question of different level

It is an online coding test and the duration is 3 hours. They test your python skills here. Questions are related to Python and Pandas. You have to write code for the given questions.

Q1. Few basic python programs related to lists, data structures, strings, Fibonacci series etc
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Q2. Asked ML related questions like regression, classification algorithms, NLP questions, evaluation metrics, how to handle if there are many attributes in dataset etc
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It was very easy and out of 1000 students 300 students got shortlisted.

Q1. It was also easy and out of 300 students 30 got shortlisted.
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Q2. What are oops? Explain 4 pillars
Ans. 
OOPs stands for Object-Oriented Programming. The 4 pillars are Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance: Allows a class to inherit properties and behavior from another class. Example: Parent class 'Animal' and child class 'Dog' inheriting from 'Animal'.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Using private variables and public methods in...read more
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Q3. What is DBMS and SQL?
Ans. 
DBMS stands for Database Management System, which is a software system that manages databases. SQL is a language used to interact with databases.
• DBMS is a software system that allows users to define, create, maintain, and control access to databases.

• SQL (Structured Query Language) is a language used to communicate with a database. It is used to retrieve, update, and manage data in a database.

• Examples of popular DBMS in...read more
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Q4. What is MongoDB? Explain it.
Ans. 
MongoDB is a NoSQL database program that uses a document-oriented data model.
• NoSQL database program

• Document-oriented data model

• Uses JSON-like documents for data storage

• Supports dynamic schemas for flexible data structures
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Q5. Explain all hooks of React.
Ans. 
React hooks are functions that let you use state and other React features without writing a class.
• Hooks are functions that let you use state and other React features in functional components

• useState() - allows functional components to have local state

• useEffect() - allows functional components to perform side effects

• useContext() - allows functional components to access context

• useReducer() - an alternative to useState() ...read more
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