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mysql sql99语法 内连接非等值连接详解
#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
#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