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SQL query Interview Question Create a Composite Key or Primary Key with Multiple Columns

In SQL Server, a Composite Key is a combination of two or more columns that uniquely identifies a record within a table. Unlike a single-column Primary Key, a Composite Key involves multiple columns working together to ensure data uniqueness. This is particularly useful when a single column cannot guarantee uniqueness by itself. The Composite Key's combination of columns helps establish a more robust and comprehensive means of identifying records, enhancing database integrity and supporting complex relationships within the SQL Server database structure.

In SQL interviews, candidates encounter various questions covering fundamental and advanced aspects. Topics include basic SQL queries, joins, real-time scenarios, and production support challenges. Database interview questions often explore the significance of Composite Keys or Primary Keys with Multiple Columns. Understanding how to create and manage these keys is crucial for ensuring data integrity and efficient query operations. A solid grasp of these concepts demonstrates a candidate's proficiency in database design and management, essential for roles ranging from data engineering to production support in the dynamic field of SQL.