CREATE TABLE MyUser (
	userName VARCHAR(12) PRIMARY KEY,
	password  VARCHAR(20) NOT NULL,
	fullName VARCHAR(30) NOT NULL,
	isAdmin boolean NOT NULL DEFAULT False -- postgreSql specific datatype
);

CREATE TABLE UserEmails (
	userName VARCHAR(12) NOT NULL REFERENCES MyUser(userName),
	email VARCHAR(30) NOT NULL,
	CONSTRAINT UserEmails_PK PRIMARY KEY (userName,email)
);