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Wayspire Ed-Tech Private Limited Interview Questions and Answers

Updated 14 Jun 2024

Q1. What is temporary table and types of temporary table

Ans.

Temporary table is a table that exists temporarily and is automatically deleted when the session ends.

  • Temporary tables are used to store intermediate results during a complex query.

  • Types of temporary tables include local temporary tables and global temporary tables.

  • Local temporary tables are only visible to the current session and are automatically dropped when the session ends.

  • Global temporary tables are visible to all sessions and are dropped when the last session using the...read more

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Q2. Difference between Subquery and correlated query

Ans.

Subquery is a query nested within another query, while correlated query is a subquery that depends on the outer query.

  • Subquery is independent of the outer query, while correlated query is dependent on the outer query

  • Subquery is executed first and its result is passed to the outer query, while correlated query is executed for each row of the outer query

  • Subquery can be used to return a single value or a list of values, while correlated query is used to compare values from the o...read more

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Q3. Difference between viewbag and viewdata

Ans.

ViewBag is a dynamic property that allows you to pass data from the controller to the view, while ViewData is a dictionary object.

  • ViewBag is a dynamic property in MVC that uses the dynamic keyword to pass data from the controller to the view.

  • ViewData is a dictionary object that is used to pass data from the controller to the view.

  • ViewBag is a wrapper around ViewData, providing a more concise syntax for passing data.

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Q4. Define joins and type of joins

Ans.

Joins are used to combine rows from two or more tables based on a related column between them.

  • Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

  • INNER JOIN returns rows when there is at least one match in both tables.

  • LEFT JOIN returns all rows from the left table and the matched rows from the right table.

  • RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

  • FULL JOIN returns rows when there is a match in one of the tabl...read more

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Q5. What is indexers

Ans.

Indexers allow objects to be indexed like arrays

  • Indexers are special properties in C# that allow objects to be indexed like arrays

  • They are defined using the 'this' keyword followed by square brackets containing the index parameters

  • Indexers can be used to access elements in a class as if it were an array

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Q6. Advantages of stored procedure

Ans.

Stored procedures offer improved performance, security, and code reusability in database operations.

  • Improved performance by reducing network traffic and optimizing query execution

  • Enhanced security by preventing SQL injection attacks and controlling access to data

  • Code reusability by allowing multiple applications to use the same stored procedure

  • Encapsulation of complex logic for easier maintenance and debugging

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