Merilytics Supervisor Interview Questions and Answers

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Q1. What is sql language
Ans. 
SQL is a programming language used for managing and manipulating relational databases.
• SQL stands for Structured Query Language

• It is used to communicate with databases to perform tasks such as querying data, updating data, and creating tables

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE

• Example: SELECT * FROM customers WHERE city = 'New York';
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Q2. What is duplicates finding in sql
Ans. 
Duplicates finding in SQL is the process of identifying and removing duplicate records from a database table.
• Use the DISTINCT keyword in a SELECT statement to retrieve unique records

• Use the GROUP BY clause with COUNT() function to identify duplicate records

• Use the ROW_NUMBER() function to assign a unique row number to each record and filter out duplicates
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Q3. What is java oops concept
Ans. 
Java OOPs concept refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Java OOPs concept includes inheritance, where a class can inherit properties and behaviors from another class.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Polymorphism allows objects to be treated as instances of their parent class, enabling fl...read more
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