When should I use primary keys in SQL?

When should I use primary keys in SQL?

Primary keys are essential for uniquely identifying records in a table. You should use them whenever you create a new table.

Can a table have more than one primary key?

No, a table can only have one primary key, but that key can consist of multiple columns, known as a composite key.

What happens if I don't use a primary key?

Without a primary key, you risk having duplicate records, which can lead to data integrity issues and make it difficult to retrieve specific records.

Are there any exceptions to using primary keys?

While it's best practice to use primary keys, in some cases like temporary tables or staging tables, you might choose not to.