Innovaccer Interview Questions and Answers for Freshers

I rate myself highly in SQL and PowerBi, with extensive experience in both tools.

• Proficient in writing complex SQL queries for data extraction, manipulation, and analysis

• Skilled in creating interactive and insightful visualizations in PowerBi

• Experience in combining data from multiple sources and transforming it into actionable insights

• Familiar with optimizing queries for performance and efficiency

• Have successfully used PowerBi to present data-driven recommendations to stakeho...read more

Different types of joins in SQL are inner join, left join, right join, and full outer join.

• Inner join: Returns rows when there is a match in both tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Full outer join: Returns rows when there is a match in either table.

Design a data structure implementing HashMap with constant time operations like INSERT, DELETE, SEARCH, GET, GET_SIZE, IS_EMPTY.

• Use a combination of hash table and linked list to achieve constant time operations.

• For INSERT and UPDATE, hash the key to get the index and store the (key, value) pair in the linked list at that index.

• For DELETE, SEARCH, and GET, hash the key to find the index, then traverse the linked list at that index to perform the operation.

• Maintain a counter f...read more

Determine if two binary trees are isomorphic by swapping left and right subtrees.

• Check if both trees are empty, return 'yes' if they are

• Perform the swap operation on any node at any level

• Compare the structures of both trees after swapping to determine isomorphism

Overfitting occurs when a model learns the noise in the training data rather than the underlying pattern.

• Regularization techniques like L1 and L2 regularization can help prevent overfitting by penalizing large coefficients.

• Cross-validation can be used to evaluate the model's performance on unseen data and prevent overfitting.

• Feature selection or dimensionality reduction techniques can help reduce overfitting by focusing on the most important features.

• Collecting more data or u...read more

Developed a predictive model to forecast customer churn for a telecom company.

• Identified key factors contributing to customer churn such as call drop rates and customer service response times.

• Collected and cleaned data from various sources including customer call logs and service records.

• Used machine learning algorithms such as logistic regression and random forest to build the predictive model.

• Achieved a prediction accuracy of 85% and provided actionable insights to reduce c...read more

Joins are used to combine rows from two or more tables based on a related column between them.

• Use JOIN keyword to combine tables based on a common column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id