SYSTIMESTAMP, sysdate and subtraction

Hello Experts!

Everything that happens is really me stumping

Version database - Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

Select sessiontimezone dbtimezone, systimestamp, double sysdate

SessionTimeZone DBTIMEZONE SYSTIMESTAMP SYSDATE
America/Phoenix-04:0017 MARCH 15 04.09.27.894994000 PM - 04:0017 MARCH 15

the column of sample_table

updated_ts timestamp (6)

When I run the following question

Select sysdate - updated_ts,.

SYSTIMESTAMP - updated_ts SUB_SYSTIMESTAMP,

updated_ts,

SYSDATE,

SYSTIMESTAMP

of sample_table

I try very hard get any explanation on this.

Thank you in advance!

Everything that happens is really me stumping

Probably because it lacks you some basics on arithmetic datetime and time zones.

See the first row of data:

(1) SYSDATE = 17 March 15 16:37:16 (Yes, SYSDATE there part of the time but your just sample does not display it)

(2) UPDATED_TS = 17 MARCH 15 16:37:15.863983

Thus (1) - (2) 0.136017 = (second)

OK so far?

(1) SYSTIMESTAMP = 17 March 15 16:37:16.516080 -04:00 = 17 March 15 20:37:16.516080 UTC

(2) UPDATED_TS = 17 March 15 16:37:15.863983 America/Phoenix = 17 March 15 23:37:15.863983 UTC

Since there is a time zone, the two operands are compared to UTC format.

This column UPDATED_TS (which holds no information TZ) is first converted to the TIMESTAMP WITH time ZONE SCHEDULE using the session TZ "America/Phoenix" (= UTC - 07:00).

So (1)-(2) = - 2:59:59.347903 (h: min: sec)

Tags: Database

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