Markone Technologies SQL Developer Interview Questions and Answers

Q1. Find 3rd highest salary
Ans. 
Use SQL query with ORDER BY and LIMIT to find 3rd highest salary
• Use ORDER BY clause to sort salaries in descending order

• Use LIMIT 2,1 to skip first two highest salaries and get the third highest salary
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Q2. Pivoting and unpivoting in SQL
Ans. 
Pivoting and unpivoting are techniques used in SQL to transform data from rows to columns and vice versa.
• Pivoting involves rotating rows into columns, typically used to summarize data.

• Unpivoting involves rotating columns into rows, typically used to normalize data.

• Pivoting can be done using the PIVOT keyword in SQL, while unpivoting can be done using the UNPIVOT keyword.
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Q3. Difference in rank and dense rank
Ans. 
Rank assigns unique rank to each row, while dense rank allows for ties in ranking.
• Rank leaves gaps in ranking sequence, while dense rank does not

• Rank(1, 2, 2, 4) = 1, 2, 3, 4

• Dense Rank(1, 2, 2, 4) = 1, 2, 2, 3
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Simple coding not that much tough

Q1. Question related to your skills
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Q2. Just basic questions
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Q1. Why u want to join
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Q1. Scenario based questions
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Q1. Types of Indexes
Ans. 
Types of indexes include clustered, non-clustered, unique, composite, and filtered indexes.
• Clustered indexes physically reorder the data in the table based on the index key.

• Non-clustered indexes create a separate structure for the index, pointing back to the original table data.

• Unique indexes ensure that no two rows have the same values in the indexed columns.

• Composite indexes are created on multiple columns to improve...read more
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Q2. Sceanrio based question
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Q1. Salary discussion
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Q2. Joining date and last working date
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Profit and loss,percentage

Q1. Why do you this job ?
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Q2. How can i believe you are the best to our company?
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Q1. Syntax of stored procedure What is cursors Joins Cte
Ans. 
Stored procedures are used to store SQL queries for reuse. Cursors are used to iterate through a result set. Joins combine data from multiple tables. CTEs are temporary result sets.
• Stored procedures are used to store SQL queries for reuse

• Cursors are used to iterate through a result set

• Joins combine data from multiple tables

• Common Table Expressions (CTEs) are temporary result sets
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Q1. Telephonic interview of SQL
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Q1. SQL technical coding test
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