查询数据库中所有表名
select table_name from information_schema.tables where table_schema='tools' and table_type='base table';
查询指定数据库中指定表的所有字段名column_name
select column_name from information_schema.columns where table_schema='tools' and table_name='content_noteinfo'
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);