VVF Interview Questions and Answers

Cubes are multidimensional data structures used for analysis and reporting. They differ from databases in their structure and purpose.

• Cubes store data in a multidimensional format, allowing for efficient analysis and reporting.

• They are designed to handle large volumes of data and provide fast query performance.

• Cubes use dimensions, measures, and hierarchies to organize and analyze data.

• Unlike databases, cubes are optimized for analytical processing rather than transactional p...read more

A SQL query to move a table from one schema to another.

• Use the ALTER TABLE statement to rename the table and move it to the new schema.

• Specify the new schema name in the ALTER TABLE statement.

• Ensure that the user executing the query has the necessary privileges to perform the operation.

A stored procedure is a precompiled set of SQL statements that can be executed on a database server.

• Stored procedures are used to encapsulate and execute complex database operations.

• They can be used to improve performance by reducing network traffic.

• Stored procedures can be parameterized and reused across multiple applications.

• They provide a level of security by allowing access to the database only through the procedure.

• Examples: Creating a stored procedure to insert data int...read more

Level Order Traversal for Binary Tree is a method to visit all nodes level by level starting from the root.

• Use a queue data structure to keep track of nodes at each level

• Start by pushing the root node into the queue

• While the queue is not empty, dequeue a node, visit it, and enqueue its children

Left join includes all records from the left table and matching records from the right table, while right join includes all records from the right table and matching records from the left table.

• Left join keeps all records from the left table, even if there are no matches in the right table.

• Right join keeps all records from the right table, even if there are no matches in the left table.

• Example: If we have a table of employees and a table of departments, a left join will inclu...read more