Dun & Bradstreet QA Lead Interview Questions and Answers

Q1. R u team player
Ans. 
Yes, I am a team player who values collaboration and communication with my colleagues.
• I believe in open communication and actively listen to my team members' ideas and feedback.

• I am willing to help out my team members when needed and work towards common goals.

• I am adaptable and can easily adjust to different team dynamics and work styles.

• I have successfully collaborated with cross-functional teams on various projects i
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Q2. What is ru expected team to be
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Q1. What is Tuples? How do you convert a string to a tuple?
Ans. 
Tuples are immutable sequences of elements. A string can be converted to a tuple using the tuple() function.
• Tuples are similar to lists but are immutable

• Elements of a tuple are enclosed in parentheses ()

• A string can be converted to a tuple using the tuple() function

• Each character in the string becomes an element in the tuple
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Q2. What is Left Join? Show one Left join for 2 data frames on Python
Ans. 
Left join is a type of join operation in SQL that returns all the rows from the left table and matching rows from the right table.
• Left join is performed using the 'left join' keyword in SQL

• In Python, left join can be performed using the 'merge' function from the pandas library

• Syntax: pd.merge(left_dataframe, right_dataframe, how='left', on='key_column')

• Example: pd.merge(df1, df2, how='left', on='id')
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Q1. Key ratios and Industry related question
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Q2. Profit ratio, leverage ratio
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Q1. Some SQL was shared and asked to explain what it was
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Q2. It was a SQL Server Common Table Expression
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Q3. General questions about experience in past projects and how you dealt with difficult situations
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Q1. Describe yourself briefly about your experience
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Q2. Tell about your current company
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On python and sql coding.they ask simple to complex questions

Q1. On data science machine learning
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There were 3 rounds for data science consultant position at Equifax. 1st round consists of Python and SQL questions and also in this round they have tested analytical thinking as well.

In 2nd round they have asked me questions from my resume and asked me to explain the projects which I have worked on in previous company. In this round they have asked me pandas related questions and asked me write code.

Q1. In Managerial round again here I have been asked questions related my projects. and no coding round in this stage.
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Q1. About reason for break if any
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Q1. Based on your resume, will ask questions based on your past questions
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Q2. When will u get #ref error and when u get #value error in excel
Ans. 
You get #REF error in Excel when a cell reference is not valid, and you get #VALUE error when a formula includes the wrong type of argument or operand.
• You get #REF error when a formula refers to a cell that is not valid, such as a deleted cell or a cell in a different sheet.

• You get #VALUE error when a formula includes the wrong type of argument, such as text instead of a number, or when an operand is not valid for the ...read more
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Q1. Reason for choosing this job and salary negotiation
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