oracle - UTC日付をオラクル日付に変換する

Question

私はこの形式の文字列を持っています:"2013-06-05T19:41:12.739"そして、それをこの形式の日付フィールドに変換する必要があります:"2013-06-05 19:41:12"

Oracleでこれを行うにはどうすればよいですか?

Answer 1

You use to_date() or to_timestamp() to convert a string literal to a date/timestamp value:

If you need the milliseconds you have to convert it into a timestamp, otherwise (if you want to discard the milliseconds) you can convert it into a date:

select to_timestamp('2013-06-05T19:41:12.739', 'yyyy-mm-dd"T"hh24:mi:ss.ff3')
from dual;

To get rid of the milliseconds, simply cast the result from the above statement to a DATE

select cast(to_timestamp('2013-06-05T19:41:12.739', 'yyyy-mm-dd"T"hh24:mi:ss.ff3') as date)
from dual;

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I need to convert it to a date field in this format:

A DATE column does NOT have a "format".

You apply a format to a DATE column when you display it. Either explicitely by using to_char() or implicitely by the NLS settings in effect (or by some code in your application).