Update only the minute, second, millisecond... on an Oracle timestamp column

I have a timestamp column on an 11g DB which, due to a coding error which has since been fixed, caused the minute, second, millisecond... to be included instead of just "00". For example,

10/7/2018 02:03:02.432000 AM

What I need is to update all of these records which have a minute, second, millisecond greater than "00" to be "00"

e.g. 10/7/2018 02:00:00.000000 AM

I've played around with the extract() function, but I just can't figure out the correct syntax.

Larry GrovesAsked:
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Kent OlsenDBACommented:
Hi Larry,

I read your statement as you want to drop the seconds and milliseconds, but your example drops the minute, too.

select systimestamp, trunc(systimestamp, 'MI') from dual;

That's an easy way to truncate the seconds and milliseconds.

Larry GrovesAuthor Commented:
Hi Kent,

Thanks for the reply.

I actually want to update the minute, second, millisecond to "0".

For example, let's say the current timestamp is 10/7/2018 02:03:02.432000 AM

update order set timecreated = 10/7/2018 02:00:00.000000 AM
where ...;

BTW. Sorry about that. I just updated my initial question and added the minute.

Kent OlsenDBACommented:
Easy enough.  :)  Just change the unit in the call to trunc().

  select systimestamp, trunc(systimestamp, 'HH') from dual;

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Larry GrovesAuthor Commented:
I guess you're right. That was easy.

Overthinking... The art of creating problems that weren't even there.

Thanks Kent! I really appreciate your help.

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