ZS
10+ Solutionstar Interview Questions and Answers
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
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
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
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.
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
Q4. 4. What should be ensured to maintain for Knowledge Transfer of project/jobs developed
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
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.
Q6. What's fact, dimensions , what's stored in them
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
Q7. 1. Different Informatica Transformations and functionality
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
Q8. 2. What is SCD and types with example
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.
Q9. Use case to design the database for startup and increase the revenue what approach
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
Q10. 3. Difference between dynamic and status lookup
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
Q11. Why ZS, swap two numbers without using extra variable
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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