CREATE TABLE IF NOT EXISTS `DateExamJam` (
    `start` DATETIME NOT NULL,
    `end` DATETIME NOT NULL,
PRIMARY KEY (`start`, `end`));

CREATE TABLE IF NOT EXISTS `DateExamJam` (
    `start` DATETIME NOT NULL,
    `end` DATETIME NOT NULL,
    `course` INT(8) NOT NULL,
PRIMARY KEY (`start`, `end`, `course`));

Implement courses in Exam Jam dates
Implement courses in Exam Jam dates
