Add constraint on values , Mysql

Question

My table

CREATE TABLE STUDENT ( 
      BCN INT not null,
      Stname varchar(50) not null,
      Sex char(1) not null ,
      primary key (BCN));

Answer 1

Use the MySQL ENUM type. "An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time."

sex ENUM ('M', 'F')