OOps concept,what is CTE in sql,explain the scenerio where you can use abstact class or interface?,N th highest salary in sql?,Polymorphism and overriding?Temp table in sql?sql functions?Difference between the store procedure and function in sql? what is your career goal?how can we use calculator service in windows application?

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Answering various technical questions related to OOPs, SQL, and software development.

CTE in SQL stands for Common Table Expression, used for creating temporary result sets.
Abstract classes are used when you want to provide a common base implementation for derived classes, while interfaces are used to define a contract that implementing classes must follow.
Nth highest salary in SQL can be achieved using the ROW_NUMBER() function.
Polymorphism allows objects of different classes to be treated as objects of a common superclass, while overriding involves a subclass providing a specific implementation of a method defined in its superclass.
Temp tables in SQL are used to store temporary data that can be used within a session or a query.
SQL functions are reusable code blocks that can accept parameters, perform actions, and return results.
Stored procedures and functions in SQL both allow you to encapsulate a set of SQL statements for reuse, but functions return a value while procedures do not necessarily return a value.
Career goal may vary for each individual, but it typically involves advancing in the field of software development and gaining expertise in specific technologies.
Calculator service in a Windows application can be implemented by creating a separate class or component that handles mathematical operations and integrating it with the user interface.

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