What is the importance of SQL keys in database management?

What is the importance of SQL keys in database management?

SQL keys are crucial for identifying records uniquely, ensuring data integrity, and establishing relationships between tables.

Can you explain the different types of SQL keys?

Sure! The main types of SQL keys are Primary Keys, Foreign Keys, Unique Keys, and Composite Keys, each serving specific purposes.

How do primary keys differ from foreign keys?

Primary keys uniquely identify a record in a table, while foreign keys link records between two tables, establishing relationships.

What happens if a primary key is not defined?

Without a primary key, a table may have duplicate records, leading to data inconsistency and difficulties in data retrieval.

Can you give an example of how to define a primary key in SQL?

Certainly! You can define a primary key in SQL using the syntax: CREATE TABLE table_name (id INT PRIMARY KEY, name VARCHAR(100));.