-- 47、查询本周过生日的学生

-- 今天是本周的第几天

select date_format(curdate(),'%w');

-- 本周的第一天

select date_sub(curdate(),interval date_format(curdate(),'%w') day);

-- 本周的最后一天

select date_add(curdate(),interval 6-date_format(curdate(),'%w') day);

select *

from stu

where date_format(s_birth,'2020-%m-%d') between date_sub(curdate(),interval date_format(curdate(),'%w') day)

and date_add(curdate(),interval 6-date_format(curdate(),'%w') day);

-- ----------------------------------------------------------------------------------

-- 48、练习：查询下周过生日的学生

-- 下周是一年中的第几周

select week(curdate())+1;

select *,week(date_format(s_birth,'2020-%m-%d'))

from stu

where week(date_format(s_birth,'2020-%m-%d'))=if(week(curdate())=52,0,week(curdate()+1));

-- ----------------------------------------------------------------------------------

-- 49、查询本月过生日的学生

select * from stu

where month(s_birth)=month(curdate());

-- ----------------------------------------------------------------------------------

-- 50、练习：查询下月过生日的学生

-- 下月的月份

select month(curdate())+1;

select *

from stu

where month(s_birth)=if(month(curdate())=12,1,month(curdate())+1);