SQL排序

Order by：

升序是asc  ，降序是desc 

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默认是升序排序：

按照name排序：

select * from user where age>18 order by name

order by 排序默认是升序排序

上述的SQL语句等同于 select * from user where age >18 order by name asc

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升序：

select * from user where address='河北' order by age asc 

id	name	address	age
1	zhangsan	河北	19
3	zhaofeng	河北	20
4	liangru	河北	21

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