select * from wap_content where week(created_at) = week(now)

如果你要严格要求是某一年的，那可以这样

查询一天：

select * from table where to_days(column_time) = to_days(now());
select * from table where date(column_time) = curdate(); 

查询一周：

select * from table  where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(column_time);

查询一个月：

select * from table  where DATE_SUB(CURDATE(), INTERVAL INTERVAL 1 MONTH) <= date(column_time);