目录一、PostgreSQL比较两天时间相减二、PostgreSQL计算两天的天数，四舍五入三、PostgreSQL天数相减得到整数附：日期时间增减总结 一、PostgreSQL比较两天时间相减
Today I was reading through some Hibernate code and I encounter something interesting. There is a class called CollectionHelper that defines the following constant varibale:
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