mysql sql99语法 内连接非等值连接详解

SELECT  salary,grade_levelFROM  employees eJOIN  job_grades gON  e.`salary` BETWEEN g.`lowest_sal` AND g.`lowest_sal`;

SELECT  COUNT(*),grade_levelFROM  job_grades jJOIN  employees eON  e.`salary` BETWEEN j.`lowest_sal`AND j.`highest_sal`GROUP BY  grade_level DESC;

SELECT last_name,department_nameFROM employees eINNER JOIN departments dON e.department_id=d.department_id;

SELECT last_name,job_titleFROM employees eINNER JOIN jobs jON e.job_id=j.job_idWHERE e.last_name LIKE ‘%e%';