oracle-databaseto-date

Using Oracle to_date function for date string with milliseconds

I have to perform some inserts into an Oracle DB. I have some dates in the following format

'23.12.2011 13:01:001'

Following the documentation I wrote inserts to_date as follows:

to_date('23.12.2011 13:01:01', 'DD.MM.YYYY HH24:MI:SS')

which works properly. Now I have dates with milliseconds with the format

'23.12.2011 13:01:001'

I've tried the following:

to_date('23.12.2011 13:01:001', 'DD.MM.YYYY HH24:MI:SSFF3')

which is incorrect (delivers an error 01821. 00000 - "date format not recognized").

Which "String" should I use for this format with milliseconds?

Solution

  • An Oracle DATE does not store times with more precision than a second. You cannot store millisecond precision data in a DATE column.

    Your two options are to either truncate the string of the milliseconds before converting it into a DATE, i.e. 

    to_date( substr('23.12.2011 13:01:001', 1, 19), 'DD.MM.YYYY HH24:MI:SS' )

    or to convert the string into a TIMESTAMP that does support millisecond precision

    to_timestamp( '23.12.2011 13:01:001', 'DD.MM.YYYY HH24:MI:SSFF3' )