oracle - Update only date on datetime field on Pl/SQL -


So I need to update some dates on the Oracle database, the field is a datetime, but I only update date and time Leave it as ... The query is also such as this: 

  update table SET field = to_date ('07312010', 'MMDDYY');

But it is overriding hours, minutes and seconds from the field, I want to update the date, but I want to leave this time, any thoughts?

You can use: 

  update table SET field = TO_DATE ('07312010' || '' TO_CHAR (field, 'HH 24: MI: SS'), 'MMDWYH 24: MI: SS');

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