最近使用sqlite查询比较多，包括连表查询等。记录一下，以免忘记！
1.先根据时间排序后选择前十条：
select * from MyBill order by createTime desc limit 10；
2.求price的和：
select sum(price) as sum from MyBill；
3.这个是有个分类表，有个账单表，根据分类中的主分类分类统计再排序：
select sum(mysum),tb.pid from"
+ "(select sum(price) as mysum,consumetype.title as tt,consumetype.parentid as pid from mybill "
+ "left join consumetype on mybill.typeid =consumetype.id "
+ "group by mybill.typeid) as tb group by tb.pid order by sum(mysum) desc";
4.这个是有个分类表，有个账单表，根据分类中的子分类分类统计再排序：
select sum(price),consumetype.title from mybill "
+ "left join consumetype on mybill.typeid =consumetype.id "
+ "group by mybill.typeid order by sum(price) desc";
5.根据时间来比较选择：
select * from MyBill where createTime < datetime(‘2015-05-19‘)
相应的其他时间函数方式如下：
* select datetime(‘now‘);
* select datetime(‘2006-10-17 00:20:00‘,‘+1 hour‘,‘-12 minute‘);
* select date(‘2006-10-17‘,‘+1 day‘,‘+1 year‘);
* select datetime(‘now‘,‘start of year‘);
* select datetime(‘now‘,‘start of month‘);
* select datetime(‘now‘,‘start of day‘);
* select datetime(‘now‘,‘+10 hour‘,‘start of day‘,‘+10 hour‘);
* select datetime(‘now‘,‘localtime‘);
* select datetime(‘now‘,‘+8 hour‘);