SELECT AVG(age), MAX(age),MIN(age) FROM table_nameavg是平均年龄，max是最大年龄，min是最小年龄
年龄最小 = 出生日最大 SELECT FROM Tb_Student WHERE Birthday = (SELECT MAX(Birthday) FROM Tb_Student)年龄最大 = 出生日最小 SELECT FROM Tb_Student WHERE Birthday = (SELECT MIN(Birthday) FROM Tb_Student)平均年龄 年龄 约等于 现在时间的年 - 出生的年 SELECT AVG( DATEDIFF (yy,...