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10+ Jio Interview Questions and Answers

Updated 17 Jan 2025

Q1. 1.what is active and Passive transformation in informatica? Project Explain. SQL query.

Ans.

Active and Passive transformation in Informatica and SQL query in a project

  • Active transformation changes the number of rows that pass through it, while passive transformation does not

  • Active transformation can change the data values, while passive transformation does not

  • Examples of active transformation include Filter, Router, and Update Strategy, while passive transformation includes Expression and Sequence Generator

  • SQL query in a project can be used to extract, manipulate, a...read more

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Q2. GIVE YOU ONE CONDITION TO TAKE YOUR THOUGHT ABOUT IT

Ans.

The condition is that I have access to all necessary resources and support.

  • Access to necessary resources such as tools, software, and data

  • Support from team members and management

  • Examples: access to testing environments, collaboration tools, training resources

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Q3. What are temp tables. Diff bet temp tables and CTE

Ans.

Temp tables are temporary tables used to store intermediate results, while CTEs are temporary result sets defined within a query.

  • Temp tables are physical tables that are created in the tempdb database and can be used multiple times within a session.

  • CTEs (Common Table Expressions) are temporary result sets that are defined within a query and can only be referenced within that query.

  • Temp tables persist until they are explicitly dropped or the session ends, while CTEs exist only...read more

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Q4. PROCESS OF TESTING

Ans.

Testing is a crucial process in software development to ensure the quality and functionality of the product.

  • Testing involves executing the software with the intent of finding defects.

  • Types of testing include unit testing, integration testing, system testing, and acceptance testing.

  • Test cases are created based on requirements and specifications.

  • Testing can be manual or automated, depending on the project and resources available.

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Q5. What is the middleware used in redux? write syntax of it. Redux seletors.

Ans.

Redux middleware is a function that intercepts actions and can modify or dispatch new actions.

  • Middleware can be used for logging, error handling, and asynchronous actions.

  • Syntax: const middleware = store => next => action => { //middleware logic }

  • Redux selectors are functions that extract specific data from the Redux store.

  • Example: const getUserName = state => state.user.name;

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Q6. Peformance tunning in SQL store procedures

Ans.

Performance tuning in SQL store procedures involves optimizing the code to improve execution speed and efficiency.

  • Identify and eliminate unnecessary code

  • Use appropriate indexing to speed up data retrieval

  • Avoid using cursors and loops whenever possible

  • Optimize query execution plan

  • Consider using stored procedures for frequently executed queries

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Q7. Sql Query. To delete Duplicate record.

Ans.

To delete duplicate records in SQL, use the DISTINCT keyword or GROUP BY clause.

  • Use the DISTINCT keyword to select unique records and delete the duplicates.

  • Use the GROUP BY clause to group records by a specific column and delete duplicates within each group.

  • Use the HAVING clause to filter out groups with more than one record.

  • Example: DELETE FROM table_name WHERE column_name NOT IN (SELECT MIN(column_name) FROM table_name GROUP BY duplicate_column);

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Q8. Index optimization in sql server

Ans.

Index optimization in SQL Server involves creating, maintaining, and optimizing indexes to improve query performance.

  • Identify and create indexes on columns frequently used in WHERE clauses

  • Regularly update statistics to ensure the query optimizer has accurate information

  • Consider using included columns to cover queries that require additional columns not in the index key columns

  • Avoid over-indexing as it can lead to decreased performance during data modifications

  • Regularly monito...read more

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Q9. Tell the overall product launch impacts

Ans.

Product launch impacts can be significant and far-reaching.

  • Increased sales and revenue

  • Brand recognition and awareness

  • Market share growth

  • Competitive advantage

  • Customer satisfaction and loyalty

  • Supply chain and logistics changes

  • Employee morale and engagement

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Q10. How to do go about identifying prospects?

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Q11. Difference between abstract class and interface

Ans.

Abstract class is a class that can have both abstract and non-abstract methods, while interface only has abstract methods.

  • Abstract class can have constructors, while interface cannot

  • A class can implement multiple interfaces, but can only inherit from one abstract class

  • Abstract class can have instance variables, while interface cannot

  • Abstract class is used when there is a need for a common base class for multiple related classes, while interface is used when there is a need fo...read more

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Q12. Role of SQL Profiler

Ans.

SQL Profiler is a tool used to monitor and capture SQL Server events and performance data.

  • SQL Profiler helps in identifying and troubleshooting performance issues in SQL Server.

  • It captures events like queries, stored procedures, errors, and more.

  • Allows users to analyze the captured data to optimize database performance.

  • Can be used to trace and monitor specific activities in real-time.

  • Helps in identifying slow queries and bottlenecks in the database.

  • Example: Using SQL Profiler...read more

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Q13. Billing System explanation

Ans.

A billing system is a software application that manages and automates the billing process for products or services.

  • A billing system generates invoices and tracks payments.

  • It can integrate with other systems such as accounting software.

  • It can also provide analytics and reporting on billing data.

  • Examples include QuickBooks, FreshBooks, and Zoho Invoice.

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Q14. String and string buffer difference

Ans.

String is immutable, while StringBuffer is mutable in Java.

  • String is immutable, meaning once created, it cannot be changed. StringBuffer is mutable and can be modified.

  • StringBuffer is synchronized, making it thread-safe. String is not synchronized.

  • StringBuffer is more efficient for concatenating multiple strings due to its mutable nature.

  • Example: String str = "Hello"; StringBuffer sb = new StringBuffer("Hello");

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Q15. Optional Classes inJAVA 8

Ans.

Optional class in Java 8 is used to represent a value that may or may not be present.

  • Optional class helps to avoid NullPointerException by explicitly handling null values.

  • It provides methods like isPresent(), ifPresent(), orElse() to work with optional values.

  • Example: Optional optionalString = Optional.ofNullable("Hello");

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Q16. Stream API and its working

Ans.

Stream API in Java provides a way to process collections of objects in a functional style.

  • Stream API allows for easy manipulation of collections using functional programming concepts like map, filter, and reduce.

  • Streams can be created from various data sources like collections, arrays, or even I/O channels.

  • Stream operations can be either intermediate (like filter or map) or terminal (like forEach or collect).

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Q17. Hashmap working

Ans.

Hashmap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.

  • Hashmap uses a hashing function to map keys to indices in an array.

  • It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

  • Example: HashMap map = new HashMap<>(); map.put("key", 1); int value = map.get("key");

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