1.Candidate and Super Key in SQL Server. 2.Difference in join and sub query. 3. How to achieve abstraction , Write the example. 4. can we write Static Function and constructor in Abstract class.

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Answers to SQL Server and OOP related questions for Senior Developer position.

Candidate key is a unique identifier for a row in a table, while super key is a set of columns that can uniquely identify a row.
Join combines data from two or more tables based on a related column, while subquery is a query within another query.
Abstraction can be achieved by creating abstract classes or interfaces that define common properties and methods for related classes.
Yes, we can write static functions and constructors in abstract classes.

1.Candidate and Super Key in SQL Server. 2.Difference in join and sub query. 3. How to achieve abstraction , Write the example. 4. can we write Static Function and constructor in Abstract class.

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