Accion Labs Interview Questions and Answers for Experienced

Q1. Interview did not turn on the camera His questions were not clear be cause of the background noise and had to ask him to repeat multiple times He sounded not interested in taking the interview and rude He ...read more
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Q2. How we handle when there are difference between the Dev team and business on SP
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Q3. Scenario based questions
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Q1. What is MVC? Explain in detail.
Ans. 
MVC is a software design pattern that separates an application into three main components: Model, View, and Controller.
• Model represents the data and business logic of the application.

• View is responsible for displaying the data to the user.

• Controller acts as an intermediary between Model and View, handling user input and updating the Model accordingly.

• MVC helps in organizing code, improving maintainability, and promotin...read more
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Q2. What is difference between InnoDB and MyIsam?
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InnoDB is a transaction-safe storage engine for MySQL, while MyISAM is not transaction-safe.
• InnoDB supports transactions with ACID properties, while MyISAM does not.

• InnoDB supports foreign keys, while MyISAM does not.

• InnoDB is more reliable and crash-safe compared to MyISAM.

• InnoDB is the default storage engine for MySQL 5.5 and higher versions.

• MyISAM is faster for read-heavy operations, while InnoDB is better for write...read more
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Q1. What is difference between interface and abstract class
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Interface defines only method signatures while abstract class can have both method signatures and implementations.
• Interface cannot have method implementations, only method signatures.

• Abstract class can have both method signatures and implementations.

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

• Interfaces are used to define a contract for classes to implement, while abstract cla...read more
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Q2. What is a static method?
Ans. 
A static method is a method that belongs to the class itself, rather than to instances of the class.
• Static methods can be called directly on the class without needing to create an instance of the class.

• Static methods are commonly used for utility functions that do not require access to instance-specific data.

• Static methods are declared using the 'static' keyword in PHP.
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Q3. Explain the steps to optimize SQL query
Ans. 
Optimizing SQL queries involves analyzing query performance, indexing, minimizing data retrieval, and using appropriate joins.
• Analyze query performance using tools like EXPLAIN to identify bottlenecks

• Use indexes on columns frequently used in WHERE clauses

• Minimize data retrieval by selecting only necessary columns

• Avoid using SELECT * and instead specify required columns

• Use appropriate joins like INNER JOIN, LEFT JOIN, e...read more
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Q1. What does the array_map in PHP used for?
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array_map in PHP is used to apply a callback function to each element of an array.
• array_map() returns an array containing all the elements of the input array after applying the callback function to each one.

• It is useful for applying a function to all elements of an array without using a loop.

• Example: array_map('strtoupper', ['apple', 'banana', 'cherry']) will return ['APPLE', 'BANANA', 'CHERRY'].
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Q2. What is callback function in PHP?
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A callback function in PHP is a function that is passed as an argument to another function and is executed at a later time.
• Callback functions are commonly used in PHP for event handling, asynchronous processing, and custom sorting.

• Example: array_map() function in PHP takes a callback function as an argument to apply a user-defined function to each element of an array.

• Another example: usort() function in PHP uses a call...read more
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Q3. Explain the workflow of PHPUnit
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PHPUnit workflow involves writing test cases, running tests, and analyzing results.
• Write test cases using PHPUnit framework

• Run tests using PHPUnit command line interface or IDE integration

• Analyze test results to identify failures and errors

• Make necessary code changes to fix failing tests

• Repeat the process until all tests pass successfully
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SQL queries and Coding to write code of booking a ticket for train

Q1. Dot net core questions
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Q1. Salary discussion
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Q2. Project discussion
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Q1. Explain project
Ans. 
Led a data pipeline project to optimize ETL processes and enhance data accessibility for analytics.
• Designed and implemented a scalable ETL pipeline using Apache Airflow.

• Utilized AWS services like S3 and Redshift for data storage and processing.

• Collaborated with data scientists to ensure data quality and integrity.

• Automated data validation processes to reduce manual errors.

• Conducted performance tuning to improve query r...read more
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Q2. Adf scenario based question
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