Question

I have a datetime field in my Postgresql, named “dt”.
I’d like to do something like

SELECT * FROM myTable WHERE extract (date from dt) = '01/01/11'

What is the right syntax to do that?

Thanks!

Answer 1

I think you want to cast your dt to a date and fix the format of your date literal:

SELECT *
FROM table
WHERE dt::date = '2011-01-01' -- This should be ISO-8601 format, YYYY-MM-DD

Or the standard version:

SELECT *
FROM table
WHERE CAST(dt AS DATE) = '2011-01-01' -- This should be ISO-8601 format, YYYY-MM-DD

The extract function doesn’t understand “date” and it returns a number.