What is a primary key in SQL?
An example of an AI chatbot conversation about primary keys in SQL.
What is a primary key in SQL?
A primary key is a unique identifier for a record in a database table. It ensures that each record can be uniquely distinguished.
Can a primary key have null values?
No, a primary key cannot have null values. It must contain unique values for each record.
What happens if I try to insert a duplicate primary key?
If you try to insert a duplicate primary key, the database will return an error, preventing the insertion.
Can a table have multiple primary keys?
No, a table can only have one primary key, but that key can consist of multiple columns, known as a composite key.
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