在Oracle数据库中创建日期主档表
Oracle提供的日期函数可以满足我们日常用到的对日期的所有操作。通常，在设计表结构的时候，我们也常常会遇到日期类型的字段
Oracle提供的日期函数可以满足我们日常用到的对日期的所有操作。通常，，在设计表结构的时候，我们也常常会遇到日期类型的字段。如果业务里面需要类似汇总给定日期所在周的资料，汇总给定日期所在月的各周资料等操作，那直接写SQL语句将比较复杂。
所以，我是直接在数据里面建立一个日期的主档表，在里面将可能用到的统计字段先计算后，后面业务逻辑的汇总只需连接这个表就可以得到想要的结果。
下面是这个表的建立和数据的生成过程，可以在里面新加字段以满足不同的需求，相关的索引可以根据自己的需要去建立！
同时欢迎大家一起讨论更好的方法！不足之处，请不吝指教！
1. 建立日期主档表
2. 插入日期资料
3. 设置相关字段的值
4. 设置每月的周别
5.设置每周的第一天和最后一天
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