POSTGRESQL日期函数大全

时间 2019-11-12

标签 postgresql 日期函数大全栏目 Postgre SQL 繁體版

原文原文链接

一：各个数据中的链接符函数

SqlServer的链接符：+（加号）spa

Sqlite的链接符：.（点）code

PostgreSQL的链接符：||（或）blog

二：get

今天在PostgreSQL计算日期的时候,翻了一些资料，不多，就记录下来吧~！it

其中使用到的函数及变量table

to_char()、Date()、now()、current_dateclass

计算两个日期的差变量

current_date为今天的日期，为：2015-06-03date

Date('2015-06-05')-current_date=2

select   to_char(current_date,'yyyy')||'-'||to_char(birthday,'mm-dd'),Date(to_char(current_date,'yyyy')||'-'||to_char(birthday,'mm-dd'))-current_date 

from tablename where delflag=0 and status=0 

and Date(to_char(current_date,'yyyy')||'-'||to_char(birthday,'mm-dd'))-current_date>=0 

and Date(to_char(current_date,'yyyy')||'-'||to_char(birthday,'mm-dd'))-current_date<=7
order by birthday desc

三：

select now() + interval '1 days'; 

select now() + interval '1 month'; 

select now() + interval '1 years';

四：

SqlServer中进行日期计算时，用到函数

CONVERT（）,DATEPART(),getDate()

select CONVERT(varchar(10),CONVERT(varchar(4),DATEPART(year,getDate()))+'-'+ CONVERT(varchar(2),DATEPART(month,birthday))+'-'+CONVERT(varchar(2),DATEPART(day,birthday)),120),datediff(day,CONVERT(varchar(10),getdate(),120),CONVERT(varchar(10),CONVERT(varchar(4),DATEPART(year,getDate()))+'-'+ CONVERT(varchar(2),DATEPART(month,birthday))+'-'+CONVERT(varchar(2),DATEPART(day,birthday)),120)) 

from tablename where delflag=0 and status=0 

and datediff(day,CONVERT(varchar(10),getdate(),120),CONVERT(varchar(10),CONVERT(varchar(4),DATEPART(year,getDate()))+'-'+ CONVERT(varchar(2),DATEPART(month,birthday))+'-'+CONVERT(varchar(2),DATEPART(day,birthday)),120))<=7 

and datediff(day,CONVERT(varchar(10),getdate(),120),CONVERT(varchar(10),CONVERT(varchar(4),DATEPART(year,getDate()))+'-'+ CONVERT(varchar(2),DATEPART(month,birthday))+'-'+CONVERT(varchar(2),DATEPART(day,birthday)),120))>=0 order by birthday desc