Can there be 2 primary keys?

Is it okay to have 2 primary keys?

A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key. If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).

How many primary keys can have in a?

The PRIMARY KEY constraint specifies that the constrained columns' values must uniquely identify each row. A table can only have one primary key, but it can have multiple unique constraints.

Can two primary keys have the same value?

A primary key is UNIQUE. The primary key attribute cannot contain duplicate values (there cannot have two records having the same value of the primary key field).

What do you call two primary keys?

Compound keys - 2 or more columns. Multiple Candidate keys can exist in a table. Primary KEY - Only one of the candidate keys that is chosen by us. Alternate keys - All other candidate keys. Both Primary Key & Alternate keys can be Compound keys.