What are some practical examples of SQL keys?
An example of an AI chatbot conversation about SQL keys in practice.
What are some practical examples of SQL keys?
SQL keys are essential for identifying records in a database. For example, a primary key uniquely identifies each row in a table, like a user ID in a users table.
Can you give me an example of a primary key?
Sure! In a table called 'Employees', the 'EmployeeID' column can serve as a primary key, ensuring each employee has a unique identifier.
What about foreign keys? How do they work?
Foreign keys link two tables together. For instance, in an 'Orders' table, a 'CustomerID' foreign key can reference the 'CustomerID' in the 'Customers' table.
Are there any other types of keys I should know about?
Yes, there are also unique keys, which ensure all values in a column are different, and composite keys, which use multiple columns to create a unique identifier.
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