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mysql数据库 时间：2024-12-24 19:13:46
作者：文/会员上传
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#案例：查询员工的工资级别SELECTsalary,grade_levelFROMemployees eJOINjob_grades gONe.`salary` BETWEEN g.`lowest_sal` AND g.`lowest_sal`;#案例：查询每个工资级别的个数
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#案例：查询员工的工资级别
SELECTsalary,grade_levelFROMemployees eJOINjob_grades gONe.`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
SELECTCOUNT(*),grade_levelFROMjob_grades jJOINemployees eONe.`salary` BETWEEN j.`lowest_sal`AND j.`highest_sal`GROUP BYgrade_level DESC;11-20
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