Xyz Company SQL Developer Interview Questions and Answers

Q1. Basics of SQL, types of joins, cursors, triggers
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Q2. Functions and Procedures and differences between them
Ans. 
Functions and procedures are both stored database objects used to perform specific tasks in SQL.
• Functions return a value while procedures do not.

• Functions can be used in SQL statements, whereas procedures cannot.

• Functions can have input parameters and return a single value, while procedures can have input and output parameters.

• Functions are typically used for calculations or data manipulation, while procedures are used...read more
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Q3. Performance tuning of SQL query
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Performance tuning of SQL query
• Identify slow queries using profiling tools

• Optimize query structure and use indexes

• Reduce data retrieval by filtering and limiting results

• Avoid using subqueries and nested queries

• Use appropriate data types and avoid unnecessary conversions
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Q1. Similar questions to TR1, but this time with more depth and at advanced level
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Q2. Given sample data on two tables, write down the result sets of all types joins.
Ans. 
The result sets of all types of joins in SQL
• Inner Join: Returns only the matching rows from both tables

• Left Join: Returns all the rows from the left table and the matching rows from the right table

• Right Join: Returns all the rows from the right table and the matching rows from the left table

• Full Outer Join: Returns all the rows from both tables, including the unmatched rows

• Cross Join: Returns the Cartesian product of b
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Q3. Write down a procedure to return a certain series (99, 96, 93, ...., 6, 3)
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Procedure to return a series (99, 96, 93, ...., 6, 3)
• Create a temporary table with a single column

• Use a loop to insert values into the temporary table

• Return the values from the temporary table in descending order
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Q4. Extract execution plan of a SQL query
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To extract execution plan of a SQL query, use EXPLAIN or SHOW PLAN command.
• Use EXPLAIN or SHOW PLAN command before the SQL query

• EXPLAIN command shows the execution plan in a tabular format

• SHOW PLAN command shows the execution plan in a graphical format

• Execution plan helps in optimizing the query for better performance
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Q1. Basic questions on project structure, development approach
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Q2. How is a change request in application serviced by development team (business analysis, code analysis, discussion with BA, requirment freeze, etc.)
Ans. 
A change request in an application is serviced by the development team through various stages such as business analysis, code analysis, discussion with BA, and requirement freeze.
• The development team starts by analyzing the change request to understand its impact on the application.

• They perform business analysis to determine the feasibility and potential risks of implementing the change.

• Code analysis is conducted to as...read more
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Q1. Casual meeting wrt expectations from project, work culture, etc.
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Q1. CTC, location negotiation
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The assessment consisted of two moderate-level questions related to data structures and algorithms, focusing on strings and 2D arrays, within a time frame of 45 minutes. In the web development section, there were 15 questions each from React and Angular.

Q1. What is object-oriented programming (OOP), and can you explain the concepts of shallow copy and deep copy? Additionally, what technology stack would you choose for a project, and what are the reasons behin...read more
Ans. 
OOP is a programming paradigm based on the concept of objects, with shallow copy creating a new object with references to the original, and deep copy creating a new object with copies of the original's values.
• OOP is a programming paradigm that focuses on objects and classes.

• Shallow copy creates a new object that references the original object's data.

• Deep copy creates a new object with copies of the original object's da...read more
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Q2. What are the features of the project?
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The project features include real-time data processing, machine learning algorithms, and user-friendly interface.
• Real-time data processing for instant updates

• Machine learning algorithms for predictive analysis

• User-friendly interface for easy navigation
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Q1. Wht is tuple and how it is dif from list
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A tuple is an immutable collection of elements, while a list is a mutable collection in Python.
• Tuples are created using parentheses (), while lists are created using square brackets []

• Tuples are immutable, meaning their elements cannot be changed once defined

• Lists are mutable, allowing for elements to be added, removed, or modified

• Tuples are typically used for fixed collections of items, while lists are used for dynami
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Q1. System design of iot machine
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Designing a system for IoT machines involves creating a network that allows devices to communicate and share data.
• Consider the communication protocols needed for devices to connect and exchange data

• Implement security measures to protect data and prevent unauthorized access

• Design a scalable architecture to handle a large number of devices and data

• Utilize cloud services for storage and processing of IoT data

• Include edge ...read more
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Linked list implementation

Q1. .net related questions
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Q1. Functional knowledge
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Q1. Discussion of salary and position
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Q1. Tell about a time where you had competing demands from stakeholders.
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3 questions of medium to hard coding questions.

Q1. Technical interview including SQL, one programming language, and dbms based questions. the interview went well and was of 90mins.
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There are 30 questions Mixed with Aptitude, AWS, OS

Q1. 1. what is OOPS Concept?
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm that uses objects to represent and manipulate data.
• OOPS focuses on the concept of objects, which are instances of classes.

• It emphasizes encapsulation, inheritance, and polymorphism.

• Encapsulation ensures data hiding and abstraction.

• Inheritance allows classes to inherit properties and behaviors from other classes.

• Polymorphism enables objects to take on multiple...read more
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Q2. Database questions and data structure questions?
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