我对Postgresql很新,如果我的问题低于平均值,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.我遇到问题的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) as varchar(3)) = 'Feb' then '02'
when cast(substring(datetext,3) as varchar(3)) = 'Mar' then '03'
when cast(substring(datetext,3) as varchar(3)) = 'Apr' then '04'
when cast(substring(datetext,3) as varchar(3)) = 'May' then '05'
when cast(substring(datetext,3) as varchar(3)) = 'Jun' then '06'
when cast(substring(datetext,3) as varchar(3)) = 'Jul' then '07'
when cast(substring(datetext,3) as varchar(3)) = 'Aug' then '08'
when cast(substring(datetext,3) as varchar(3)) = 'Sep' then '09'
when cast(substring(datetext,3) as varchar(3)) = 'Oct' then '10'
when cast(substring(datetext,3) as varchar(3)) = 'Nov' then '11'
when cast(substring(datetext,3) as varchar(3)) = 'Dec' then '12'
end,cast(substring(datetext,6,2) as varchar(2))) as dt
from tbl_loading_horses_tmp