mysql sql99语法 内连接非等值连接
#案例：查询员工的工资级别
SELECT
salary,grade_level
FROM
employees e
JOIN
job_grades g
ON
e.`salary` BETWEEN g.`lowest_sal` AND g.`lowest_sal`;#案例：查询每个工资级别的个数，并且按级别降序
SELECT
COUNT(*),grade_level
FROM
job_grades j
JOIN
employees e
ON
e.`salary` BETWEEN j.`lowest_sal`AND j.`highest_sal`
GROUP BY
grade_level DESC;温馨提示: 本文由Jm博客推荐，转载请保留链接: https://www.jmwww.net/SQL/21151.html
