American Express Interview Questions, Process, and Tips

Q1. How can concatenate in sql?
Ans. 
Concatenate in SQL is done using the CONCAT function or the + operator.
• Use the CONCAT function to concatenate strings in SQL, for example: SELECT CONCAT(first_name, ' ', last_name) AS full_name FROM employees;

• Alternatively, you can use the + operator to concatenate strings, for example: SELECT first_name + ' ' + last_name AS full_name FROM employees;
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Q1. How to optimize SQL Joins
Ans. 
Optimizing SQL Joins involves using proper indexing, limiting the result set, and avoiding unnecessary joins.
• Use indexes on columns involved in join conditions to improve performance

• Limit the result set by using WHERE clause to filter out unnecessary rows before joining

• Avoid unnecessary joins by only joining the tables that are needed for the query
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Q2. How to optimize performance
Ans. 
Optimizing performance involves setting clear goals, providing feedback, offering training and development opportunities, and fostering a positive work environment.
• Set clear goals and expectations for employees

• Provide regular feedback and recognition for good performance

• Offer training and development opportunities to help employees improve their skills

• Create a positive work environment that promotes collaboration and c...read more
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2 medium dsa que - one is of binary search, one is from graph

Q1. Define oops principle
Ans. 
OOPs principles are the fundamental concepts of object-oriented programming that help in designing and implementing software solutions.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: The ability of different classes to be treated as instances of a common superclass.

• Abstraction: ...read more
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Q2. Define os concepts
Ans. 
OS concepts refer to fundamental principles and components of operating systems.
• Process management - handling processes, scheduling, and resource allocation

• Memory management - managing memory allocation, virtual memory, and paging

• File system - organizing and accessing files on storage devices

• Device management - controlling and communicating with hardware devices

• Security and protection - ensuring system and data securit...read more
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Q1. Tell me about your projec5
Ans. 
I led a project to streamline inventory management processes for a retail company.
• Identified inefficiencies in current inventory management system

• Implemented barcode scanning system to track inventory in real-time

• Collaborated with cross-functional teams to ensure successful implementation
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Q2. Guwss no. Of credits cards in india
Ans. 
The number of credit cards in India is constantly changing due to various factors such as economic conditions and consumer behavior.
• The number of credit cards in India is estimated to be around 50-60 million.

• The number of credit cards issued in India has been steadily increasing over the years.

• Major credit card issuers in India include HDFC Bank, ICICI Bank, SBI, and Axis Bank.
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Q1. Basic Finance & accounts related Questions
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Q1. Spring boot questions
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Q2. Core Java & Java 8 basics
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Q1. Threads using java8
Ans. 
Java 8 introduced new features for working with threads, such as CompletableFuture and parallel streams.
• Java 8 introduced CompletableFuture class for asynchronous programming.

• Parallel streams in Java 8 allow for easy parallelization of operations on collections.

• New methods like `join()` and `thenApply()` were added to the Thread class in Java 8.
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Q2. Maximum sub array
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