how to create primary keys in sql code example

Example 1: how to define a composite primary key in sql

CREATE TABLE person(id INT, 
					name TEXT,
					PRIMARY KEY (id, name)
				   );

Example 2: primary key in sql

The PRIMARY KEY constraint uniquely identifies each record in a table.
Primary keys must contain UNIQUE values, and cannot contain NULL values. 
A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).