student和score表mysql语句

score表 student表 – 从student表中查询年龄18~22岁的学生信息 SELECT * FROM student WHERE 2017-birth BETWEEN 18 AND 22; – 从student表中查询每个院系有多少人 SELECT department,COUNT(*) FROM student GROUP BY department – 计算每个学生的总成绩 SE

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