iEnergizer SQL Developer Interview Questions and Answers

Q1. Tell about yourself
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Q2. What is you strengths
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Q3. How many projects you make from sketch
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Q1. What is reactjs?
Ans. 
ReactJS is a JavaScript library for building user interfaces.
• ReactJS is developed and maintained by Facebook.

• It allows developers to create reusable UI components.

• ReactJS uses a virtual DOM for better performance.

• It follows a component-based architecture.

• ReactJS can be used to build single-page applications.
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Q2. What is call, apply and bind in javascript?
Ans. 
call, apply, and bind are methods in JavaScript used to manipulate the context of a function.
• call() is used to invoke a function with a specified 'this' value and arguments provided individually.

• apply() is similar to call() but arguments are passed as an array.

• bind() is used to create a new function with a specified 'this' value and initial arguments.
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Q3. Data Types in javascript
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JavaScript has several data types including string, number, boolean, object, array, null, and undefined.
• String: 'hello'

• Number: 42

• Boolean: true or false

• Object: { key: value }

• Array: [1, 2, 3]

• Null: null

• Undefined: undefined
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2 DSA questions. Both medium level difficult

Q1. Tell me about yourself
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Q2. What is DBMS? Are you aware about mysql
Ans. 
DBMS stands for Database Management System. Yes, I am aware of MySQL.
• DBMS is a software that manages databases, allowing users to interact with the data stored within them.

• MySQL is a popular open-source relational database management system.

• DBMS provides functionalities like data storage, retrieval, update, and deletion.

• MySQL uses SQL (Structured Query Language) for querying and managing the database.

• DBMS ensures data
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Q3. What is relational database
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Relational database is a type of database that stores and provides access to data points that are related to one another.
• Organizes data into tables with rows and columns

• Uses structured query language (SQL) to manipulate data

• Establishes relationships between tables using keys (primary and foreign keys)

• Examples: MySQL, PostgreSQL, Oracle Database
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Q1. Salary negotiation
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Q1. How to handle data load
Ans. 
Handle data load by optimizing database queries, using indexing, caching, and load balancing.
• Optimize database queries to reduce load on servers

• Use indexing to speed up data retrieval

• Implement caching to store frequently accessed data

• Utilize load balancing to distribute data load evenly across servers
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Q2. What is paging describe how it works
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Paging is a memory management scheme that allows the operating system to use secondary storage as an extension of the computer's primary memory.
• Paging divides the physical memory into fixed-size blocks called pages.

• Virtual memory is divided into fixed-size blocks called frames.

• The operating system keeps track of the mapping between pages and frames using a page table.

• When a process requests data that is not in physical...read more
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Q3. What is connection string
Ans. 
A connection string is a string that specifies information about a data source and the means of connecting to it.
• Contains information such as server name, database name, authentication details, etc.

• Used by applications to establish a connection to a database or other data source.

• Formatted in a specific way depending on the database management system being used.

• Example: 'Server=myServerAddress;Database=myDataBase;User I
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Q4. Difference between procedure and functions
Ans. 
Procedures do not return values, functions return values.
• Procedures are a set of instructions that perform a specific task, but do not return a value.

• Functions are also a set of instructions that perform a specific task, but they return a value.

• Functions can be called within expressions, while procedures cannot.

• Example: Procedure to display a message vs Function to calculate the sum of two numbers.
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Q1. Tell me about yourself.
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Q2. What is the business
Ans. 
The business refers to the organization or entity that provides goods or services to customers in exchange for payment.
• It involves creating and selling products or services

• It requires marketing and advertising to attract customers

• It involves managing finances and operations to ensure profitability

• Examples include retail stores, restaurants, and online businesses
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Q1. Related the job and core subject
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