removing milliseconds from a oracle tmstmp field

Question

I have a TIMESTAMP(6) field in Oracle and I need to remove the millisecond component from the time.

For example I have

10/20/2014 10:34:06.356000 AM

and I would like to remove the milliseconds so that I have

10/20/2014 10:34:06 AM

Do you know the best way to do this?

Thank you!

Solution 1

How about this?

select cast(col as timestamp(0))

EDIT:

The easiest way to avoid rounding is to use trunc() or to subtract half a second:

select cast(col - 0.5/(24*60*60) as timestamp(0))

Solution 2

You can either cast it to a timestamp with no fractional seconds (this will round to the nearest second):

CAST( your_timestamp AS TIMESTAMP(0) )

Or to a DATE data type (this will truncate to the nearest second):

CAST( your_timestamp AS DATE )

If you want it as a TIMESTAMP(0) data type then cast it back:

CAST( CAST( your_timestamp AS DATE ) AS TIMESTAMP(0) )

Or you can convert it to a formatted string and specify the format model you want to use (this will truncate to the nearest second):

TO_CHAR( your_timestamp, 'YYYY-MM-DD HH24:MI:SS' )

Like this:

SQL Fiddle

Oracle 11g R2 Schema Setup:

CREATE TABLE your_table ( your_timestamp ) AS
  SELECT TIMESTAMP '2017-10-25 12:53:12.10076' FROM DUAL;

Query 1:

SELECT CAST( your_timestamp AS TIMESTAMP(0) ) AS "Timestamp",
       CAST( your_timestamp AS DATE ) AS "Date",
       TO_CHAR( your_timestamp, 'DD-MM-YYYY HH24:MI:SS' ) AS "String"
FROM   your_table

Results:

|             Timestamp |                 Date |              String |
|-----------------------|----------------------|---------------------|
| 2017-10-25 12:53:12.0 | 2017-10-25T12:53:12Z | 25-10-2017 12:53:12 |

note: How the TIMESTAMP and DATE are formatted in the output will depend on your NLS_TIMESTAMP_FORMAT and NLS_DATE_FORMAT session parameters but you can directly control the formatting of TO_CHAR when you specify a format model.

Solution 3

try this

SELECT TO_CHAR(SYSDATE, 'MM-DD-YYYY HH24:MI:SS') "NOW"
FROM DUAL;

if you need 12-hour date format

SELECT TO_CHAR(SYSDATE, 'MM-DD-YYYY HH:MI:SS AM') "NOW"
FROM DUAL;

SQL FIDDLE

Comments

[user3022875]

this works but it does rounding. Is there a way to make it not round and just remove the milliseconds without rounding up or down?

[user3022875]

this works but I need the filed to be a timestamp(0). when I run your code I lose the AM/PM and the time loses its GMT format. Can it be cast to a timestamp(0)? then it might work

[HaveNoDisplayName]

if you need 12 hrs format with AM/PM then use the second query

[user3022875]

but this is still a CHAR. I need it timestamp(0). is that possible?