21n78e Creative Labs Data Analyst Interview Questions and Answers

Q1. Tell me about your projects
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Q2. Tell me yourself
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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;
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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.
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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.
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Q1. SQL Window Functions and RANK, DENSE RANK Difference
Ans. 
SQL Window Functions like RANK and DENSE RANK are used to assign a rank to rows within a partition.
• RANK function assigns a unique rank to each distinct row within a partition.

• DENSE RANK function assigns a unique rank to each distinct row within a partition, but without any gaps.

• Both functions are used with the OVER() clause in SQL to define the partition and order of rows.
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Q2. Hadoop Default Replication Factor
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Q1. Questions on vlook up, h-look up, pivot and if else condition
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Q2. You must know how to use vlook up, h-look up and if-else condition
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Excel file was give, used sumifs, countifs , index match formulas

Q1. What are SQL Joins?
Ans. 
SQL Joins are used to combine rows from two or more tables based on a related column between them.
• SQL Joins are used to retrieve data from multiple tables based on a related column between them.

• Common types of SQL Joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;
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Q2. Different functions in Python numpy
Ans. 
Python numpy provides various functions for numerical operations on arrays.
• numpy.sum() - calculates the sum of array elements

• numpy.mean() - calculates the mean of array elements

• numpy.max() - returns the maximum value in an array

• numpy.min() - returns the minimum value in an array

• numpy.std() - calculates the standard deviation of array elements
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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

Basic dsa question in python and data engineering questions ,sql

Basic dsa question in python and data engineering questions

Q1. Salary negotiation
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