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select * from student order by birthday;
select * from student order by birthday desc;
select * from student where gender = '男' order by birthday;
select * from student where gender = '女' order by birthday desc;
select distinct national '民族' from student;SELECT * FROM student where classNo = 202202;
SELECT * FROM student where classNo < 202202;
SELECT * FROM student where classNo > 202202;
SELECT * FROM student where classNo != 202202;
SELECT * FROM student where classNo <> 202202;
SELECT * FROM student where classNo = 202202;
SELECT * FROM student where classNo = （'202202'+100);
SELECT * FROM student where birthday < '2005-01-01' and gender = '男';
SELECT * FROM (select * FROM student where birthday < '2002-01-01') a where a.gender='男';
SELECT * FROM student where phone = '13800138019' or phone = '13800138009';SELECT * FROM student;
SELECT studentName,gender FROM student;