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10+ Solutionstar Interview Questions and Answers

Updated 3 Mar 2024
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Q1. Ways To Make Coin Change

Given an infinite supply of coins of varying denominations, determine the total number of ways to make change for a specified value using these coins. If it's not possible to make the c...read more

Ans.

The task is to determine the total number of ways to make change for a specified value using given denominations of coins.

  • Create a function that takes the number of denominations, the denominations array, and the value to make change for as input parameters.

  • Use dynamic programming to iterate through all possible combinations of coins to make the change.

  • Keep track of the number of ways to make change for each value from 0 to the target value.

  • Return the total number of ways to ...read more

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Q2. Diagonal Order Problem Statement

Given a 2D matrix, output all elements of the matrix in diagonal order, starting from the top-left element and proceeding diagonally.

Input:

Line 1: Two integers, R and C, denot...read more
Ans.

The problem involves outputting elements of a 2D matrix in diagonal order, alternating directions.

  • Iterate through the matrix diagonally, starting from the top-left element.

  • Alternate the direction of traversal from bottom-left to top-right and vice versa.

  • Handle large matrices efficiently by taking advantage of matrix properties.

  • Example: For a 3x3 matrix [1, 2, 3, 4, 5, 6, 7, 8, 9], the output should be 1 2 4 7 5 3 6 8 9.

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Q3. What SQL query would you use to generate a report of customer churn based on the data in the case study?
Ans.

Use SQL query to generate a report of customer churn based on case study data.

  • Identify the criteria for customer churn in the case study data (e.g. last purchase date, account status)

  • Select the relevant fields from the database tables (e.g. customer ID, churn date)

  • Filter the data to include only customers who meet the churn criteria

  • Group the data by relevant time periods (e.g. monthly, quarterly) to analyze churn trends

  • Calculate the churn rate by dividing the number of churne...read more

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Q4. 4. What should be ensured to maintain for Knowledge Transfer of project/jobs developed

Ans.

To maintain knowledge transfer of project/jobs developed, ensure documentation, training, and continuous communication.

  • Document all project/job details, processes, and procedures.

  • Provide training sessions to transfer knowledge and skills.

  • Encourage continuous communication and collaboration among team members.

  • Establish a knowledge sharing platform or repository.

  • Conduct regular knowledge transfer meetings or workshops.

  • Assign mentors or experienced team members to guide and supp...read more

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Q5. What is an index in SQL?
Ans.

An index in SQL is a data structure that improves the speed of data retrieval operations on a database table.

  • Indexes are used to quickly locate data without having to search every row in a table.

  • They can be created on one or more columns in a table.

  • Examples of indexes include primary keys, unique keys, and non-unique indexes.

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Q6. What's fact, dimensions , what's stored in them

Ans.

Fact and dimensions are components of a data warehouse. Facts are numerical data while dimensions are descriptive data.

  • Facts are quantitative data that can be measured, such as sales revenue or number of customers.

  • Dimensions are descriptive data that provide context for the facts, such as time, location, or product.

  • Facts and dimensions are stored in a data warehouse, which is a large repository of data used for analysis and reporting.

  • Facts are stored in fact tables, while dim...read more

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Q7. 1. Different Informatica Transformations and functionality

Ans.

Informatica Transformations are used to manipulate data during ETL process.

  • Aggregator: performs calculations on groups of data

  • Filter: filters rows based on a condition

  • Joiner: joins data from two sources based on a common key

  • Lookup: retrieves data from a database table or flat file

  • Rank: assigns a rank to each row based on a specified column

  • Router: routes data to different targets based on a condition

  • Sorter: sorts data based on one or more columns

  • Source Qualifier: extracts data...read more

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Q8. 2. What is SCD and types with example

Ans.

SCD stands for Slowly Changing Dimensions. It is a technique used in data warehousing to track changes in data over time.

  • Type 1 SCD: Overwrite the old data with new data. Example: Customer address change.

  • Type 2 SCD: Create a new record for the change. Example: Employee promotion.

  • Type 3 SCD: Create a new attribute to store the change. Example: Product price change.

  • Type 4 SCD: Create a separate table to store the change history. Example: Customer purchase history.

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Q9. Use case to design the database for startup and increase the revenue what approach

Ans.

Design a database for a startup to increase revenue.

  • Identify key business processes and data requirements

  • Design a relational database schema to store the necessary data

  • Optimize the database structure for efficient querying and data retrieval

  • Implement data validation and integrity constraints

  • Consider scalability and future growth

  • Leverage data analytics and business intelligence tools for revenue optimization

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Q10. 3. Difference between dynamic and status lookup

Ans.

Dynamic lookup is done at runtime while status lookup is done at design time.

  • Dynamic lookup is used when the lookup values are not known at design time.

  • Status lookup is used when the lookup values are known at design time.

  • Dynamic lookup requires more processing power as it is done at runtime.

  • Status lookup is faster as it is done at design time.

  • Example of dynamic lookup: retrieving a list of available payment methods from a database.

  • Example of status lookup: selecting a status...read more

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Q11. Why ZS, swap two numbers without using extra variable

Ans.

To swap two numbers without using an extra variable, you can use arithmetic operations like addition and subtraction.

  • Store the sum of the two numbers in one of the variables, then subtract one number from the sum to get the other number.

  • For example, to swap numbers a=5 and b=10: a = a + b; b = a - b; a = a - b; Now a=10 and b=5.

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4 Interview rounds
Aptitude Test Round
Coding Test Round
Case Study Round
Personal Interview1 Round
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