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Oracle date to hundredths of a second

Oracle Database Tips by Donald Burleson

Question:  In have incoming data that records hundredths of a second and I cannot find a DATE format (i.e. nls_date_format) to hold hundredths of a second.

Answer:  It's tempting to try the SSSS date format, but you annot use the "SSSS" format for milliseconds because SSSS is the number of seconds after midnight.

Instead, you need to use the TIMESTAMP datatype instead of the DATE datatype.  The TIMESTAMP datatype has fractional seconds, as noted by the FF notation:

     'DD-Mon-YYYY HH24:MI:SS.FF'

For example, you can define a TIMESTAMP column and store data into it, something like this:

create table t1 (timecol TIMESTAMP);

insert into T1 (timecol) values

this query will convert to fractional seconds:

   to_char(sysdate, 'DD-Mon-YYYY HH24:MI:SS'),
         sysdate, 'DD-Mon-YYYY HH24:MI:SS'
      )||'.55', 'DD-Mon-YYYY HH24:MI:SS.FF')

If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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