如何在postgres中更新日期格式？

Question

I have dates in the database with the format YYYYMMDD. But i would like to update them all to MM/DD/YYYYY.

How do i do that?

Answer 1

There is no format stored in the date/time data types. If you want an specific output format use the to_char function

select to_char(current_date, 'MM/DD/YYYY');

If the date column is text then first cast it to date to use the above function

select to_char(start_date::date, 'MM/DD/YYYY');