primary key can be composite? 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: how to make multiple keys as primary in bdms

CREATE TABLE `Donor`(
  `did` int(50) NOT NULL,
  `oid` int(50) NOT NULL,
  `dname` varchar(50) NOT NULL,
  `dblood` varchar(50) NOT NULL,
  PRIMARY KEY (`did`, `oid`)
);