Digitalvision Technology Interview Questions and Answers

Q1. Difference between SQL and PL/SQL
Ans. 
SQL is a standard language for managing relational databases, while PL/SQL is Oracle's proprietary extension for SQL with procedural features.
• SQL is a standard language used to manage and manipulate relational databases.

• PL/SQL is Oracle's proprietary extension to SQL that adds procedural programming capabilities.

• SQL is used for querying and updating data, while PL/SQL is used for writing stored procedures, functions, a...read more
Answered by AI
Add your answer
Q2. What is trigger
Ans. 
A trigger is a special kind of stored procedure that is automatically executed when certain events occur in a database.
• Triggers can be used to enforce business rules, perform data validation, or automate tasks.

• Examples of trigger events include INSERT, UPDATE, and DELETE operations on a table.

• Triggers can be defined to execute before or after the triggering event.
Answered by AI
Add your answer

Q1. Difference between union and union all in SQL?
Ans. 
Union combines and removes duplicates, Union All combines without removing duplicates.
• Union combines result sets and removes duplicates

• Union All combines result sets without removing duplicates

• Union is slower than Union All as it involves removing duplicates

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FROM table1 UNION ALL SELECT column1 FROM table2;
Answered by AI
Add your answer
Q2. How to show top 5 in pandas?
Ans. 
To show top 5 in pandas, use the nlargest() function.
• Use the nlargest() function with the 'n' parameter set to 5 to get the top 5 values in a pandas DataFrame.

• For example: df['column_name'].nlargest(5) will return the top 5 values in the specified column.
Answered by AI
Add your answer

Q1. If we have 3 numerical columns, which chart is a better representation these column?
Ans. 
A scatter plot is a better representation for 3 numerical columns.
• Use a scatter plot to show the relationship between the numerical columns.

• Scatter plots are effective for visualizing correlations and patterns in data.

• Each point on the plot represents a data point with values from all 3 columns.
Answered by AI
Add your answer

Easy leetcode data structure question

Q1. Write working code for calling a rest API, design rate limiter
Ans. 
Code for calling a REST API and designing a rate limiter
• Use a library like requests or axios to make the API call

• Implement a token bucket algorithm for rate limiting

• Set a maximum number of requests per second and queue excess requests

• Consider using a distributed rate limiter for scalability
Answered by AI
Add your answer

Q1. Design Database schema for instagram
Ans. 
Design a database schema for Instagram.
• Create tables for users, posts, comments, likes, and follows.

• Use primary and foreign keys to establish relationships between tables.

• Store user data such as username, email, and password securely.

• Include fields for post content, location, and timestamp.

• Track likes and comments on posts.

• Implement a notification system for follows and likes.

• Consider scalability and performance in the...read more
Answered by AI
Add your answer

Q1. Ledger details posting profile
Add your answer
Q2. Fixed Asset project management and accounting
Add your answer

Q1. Basic SQL related- had to write 2 queries with basic joins.
Add your answer
Q2. Questions related to past experience
Add your answer
Q3. Drill down of 2 projects.
Ans. 
Managed project to implement new inventory system and led team in redesigning customer service process.
• Implemented new inventory system to streamline operations

• Led team in redesigning customer service process to improve efficiency

• Successfully managed project timelines and budgets

• Collaborated with cross-functional teams to ensure project success
Answered by AI
Add your answer

HTML, HTML5 ,CSS , Bootstrap, javaScript