Postgres String to Date示例10Apr77至10/04/1977

Question

大家下午好,

我对PostgreSQL很新,如果我的问题低于平均水平,请提前道歉.

我正在以csv flay文件格式接收一些数据,很好地插入到临时表中以供我预览数据.关于我遇到的问题是数据字段存储为字符串值.例如,10Apr96 - 01Jan85

我写了下面的查询,看看是否可以打破字符串并以日期格式连接在一起.

有没有更简单的方法来实现我正在做的事情？

select 
concat(cast(substring(datetext,1,2) as varchar(2)),'/',case 
when cast(substring(datetext,3,3) as varchar(3)) = 'Jan' then '01'
when cast(substring(datetext,3,3) as varchar(3)) = 'Feb' then '02'
when cast(substring(datetext,3,3) as varchar(3)) = 'Mar' then '03'
when cast(substring(datetext,3,3) as varchar(3)) = 'Apr' then '04'
when cast(substring(datetext,3,3) as varchar(3)) = 'May' then '05'
when cast(substring(datetext,3,3) as varchar(3)) = 'Jun' then '06'
when cast(substring(datetext,3,3) as varchar(3)) = 'Jul' then '07'
when cast(substring(datetext,3,3) as varchar(3)) = 'Aug' then '08'
when cast(substring(datetext,3,3) as varchar(3)) = 'Sep' then '09'
when cast(substring(datetext,3,3) as varchar(3)) = 'Oct' then '10'
when cast(substring(datetext,3,3) as varchar(3)) = 'Nov' then '11'
when cast(substring(datetext,3,3) as varchar(3)) = 'Dec' then '12'
end,'/',cast(substring(datetext,6,2) as varchar(2))) as dt
from tbl_loading_horses_tmp

Answer 1

您可以使用该to_date()函数,该函数采用如何解释输入的格式字符串,并返回一个date值,该值应该存储在数据库中.

SELECT to_date('10Apr96', 'DDMonYY');
  to_date   
------------
 1996-04-10
(1 row)

要在检索显示时将其转换回不同格式的字符串,请使用to_char()同一页面上记录的功能.