Freshers Universe SQL Developer Interview Questions and Answers

Q1. Types of Indexes
Ans. 
Types of indexes include clustered, non-clustered, unique, composite, and filtered indexes.
• Clustered indexes physically reorder the data in the table based on the index key.

• Non-clustered indexes create a separate structure for the index, pointing back to the original table data.

• Unique indexes ensure that no two rows have the same values in the indexed columns.

• Composite indexes are created on multiple columns to improve...read more
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Q2. Sceanrio based question
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Q1. Salary discussion
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Q2. Joining date and last working date
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Profit and loss,percentage

Q1. Why do you this job ?
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Q2. How can i believe you are the best to our company?
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Learn basics of aptitude

Q1. Learn oops conceps and knowledge of coding in any language
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Q1. What are your strengths and weaknesses?
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Q2. Tell me about yourself.
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Q1. Discussion about my previous project
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Q2. Question on html, css, javascript & react
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Q3. Explain about promises
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Example: const myPromise = new Promise((resolve, reject) => { ... });
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Q4. Use state, context api
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Q5. Box modelling in css, css pre processors
Ans. 
Box model in CSS refers to the way elements are rendered in a web page. CSS preprocessors like SASS or LESS help streamline CSS development.
• Box model in CSS includes content, padding, border, and margin.

• CSS preprocessors like SASS or LESS allow for variables, nesting, and mixins to be used in CSS.

• Example: box-sizing: border-box; in CSS changes the box model to include padding and border in the element's total width and
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Q1. Reverse an array using Java 8
Ans. 
Using Java 8, reverse an array of strings
• Use Arrays.stream() to convert the array to a stream

• Use Collections.reverse() to reverse the stream

• Use Collectors.toList() to convert the stream back to a list
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Q1. Code a controller class , service class, entity and repository
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Code a controller, service, entity, and repository classes for a software application.
• Create a controller class to handle incoming requests and interact with the service layer.

• Develop a service class to implement business logic and interact with the repository.

• Define an entity class to represent data in the application.

• Implement a repository class to handle database operations for the entity.
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Q2. Basic questions about steams
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Q1. How do you optimize Stored procedure
Ans. 
Optimizing stored procedures involves using proper indexing, reducing unnecessary loops, and minimizing database calls.
• Use proper indexing on columns used in WHERE clauses to improve query performance

• Avoid using cursors and loops whenever possible, as they can be inefficient

• Minimize the number of database calls by combining multiple queries into a single query or using temporary tables

• Consider using bulk processing tec...read more
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Q2. How do you optimize SQL query
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Optimizing SQL queries involves using indexes, minimizing data retrieval, avoiding unnecessary joins, and optimizing query structure.
• Use indexes on columns frequently used in WHERE clauses

• Minimize data retrieval by selecting only necessary columns

• Avoid unnecessary joins by using EXISTS or IN clauses instead

• Optimize query structure by using appropriate join types and conditions
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Q3. What is use of returning clause
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Returning clause is used to return a value from a function or procedure in PL/SQL.
• Used to return a single value from a function or procedure

• Can be used to return multiple values using OUT parameters

• Helps in passing values back to the calling program
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Q4. Disadvantages of triggers
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Triggers can lead to performance issues, complexity, and potential for unintended consequences.
• Triggers can make code harder to debug and maintain

• They can lead to cascading effects if not carefully implemented

• Performance can be impacted if triggers are not optimized

• Triggers can introduce dependencies between different parts of the codebase
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Easy exam sample available on youtube

Q1. What are step functions.
Ans. 
Step functions are a type of serverless function that allow you to create workflows by chaining multiple functions together.
• Step functions are used to coordinate multiple AWS services into serverless workflows.

• They allow you to define a series of steps in a workflow, with each step being a separate function.

• You can use step functions to handle complex business logic, long-running processes, and error handling.

• Step func...read more
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Q2. How to scale lambdas
Ans. 
Scaling lambdas involves optimizing memory usage, increasing concurrency, and managing dependencies.
• Optimize memory usage by reducing unnecessary variables and objects

• Increase concurrency by using asynchronous programming and parallel processing

• Manage dependencies by breaking down functions into smaller, more modular components

• Consider using AWS Lambda Provisioned Concurrency for consistent performance
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Q1. How did you handled a difficult collegelue
Ans. 
I addressed the issue directly and professionally, seeking to understand their perspective and find common ground.
• Approached the colleague privately to discuss the issue

• Listened actively to their concerns and perspective

• Sought to find common ground and reach a resolution

• Maintained professionalism and respect throughout the conversation
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Q1. Angular life cycle, angular loading and some scenarios about authentication
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Q2. Javascript out put based questions based on it's execution
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