给出日期-天气表，求所有比前一天温度高的日期的Id.
+---------+------------------+------------------+
| Id(INT) | RecordDate(DATE) | Temperature(INT) |
+---------+------------------+------------------+
| 1 | 2015-01-01 | 10 |
| 2 | 2015-01-02 | 25 |
| 3 | 2015-01-03 | 20 |
| 4 | 2015-01-04 | 30 |
+---------+------------------+------------------+
解法
select a.Id from Weather a, weather b
where a.RecordDate = DATE_ADD(b.RecordDate, INTERVAL 1 DAY)
AND a.Temperature > b.Temperature
select date_add(now(), interval 1 day); - 加1天
select date_add(now(), interval 1 hour); -加1小时
select date_add(now(), interval 1 minute); - 加1分钟
select date_add(now(), interval 1 second); -加1秒
select date_add(now(), interval 1 microsecond);-加1毫秒
select date_add(now(), interval 1 week);-加1周
select date_add(now(), interval 1 month);-加1月
select date_add(now(), interval 1 quarter);-加1季
select date_add(now(), interval 1 year);-加1年
