mysql学习（十一）嵌套查询 排序 分组

1. select * from products where id in(select id from cats where name like '%java%');//查找类型中名字中包含java的的商品信息
2. order by 字段名字 desc /asc
3. select * from products order by price desc;//按照降序排列
4. limit 
5. select * from products order by price limit 1;//取出价格便宜的商品
6. select * from products where id < 14 limit 0, 1 //id为14的上一条

7. mysql> select * from products where id > 3 order by price desc limit 0, 1;
   +----+-----+------+-------+----------------+-----+
   | id | cid | name | price | desn | num |
   +----+-----+------+-------+----------------+-----+
   | 5 | 5 | java | 8.18 | this is a java | 3 |
   +----+-----+------+-------+----------------+-----+

8. count()
9. max()
10. avg()
11. min()
12. sum()
13. group by
14. having