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首先,order by是用来写在where之后,给多个字段来排序的一个DQL查询语句。
其次,order by写法:
1. select 字段列表/* from 表名 where 条件 order by 字段名1 asc/desc, 字段名2
asc/desc,.......
2. select 字段列表/* from 表名 where 条件 order by 字段序号 asc/desc, 字段序号
asc/desc,....... (此时字段序号要从1开始)
3. select 字段列表/* from 表名 where 条件 order by 字段别名1 asc/desc, 字段别名2
asc/desc,.......(这里类似于第一种,无非就是把字段名加了个别名来代替而已。)
然后,order by的方式:
1.asc 升序,可以省略,是数据库默认的排序方式
2.desc 降序,跟升序相反。
最后要注意order by的原则,写在最前面的字段,他的优先级最高,也就是写法中第一个的字段名1的优先级最高,优先执行他的内容。