difference between systimestamp and systimestamp value table


Hello

With the help of Oracle 11 g R2.

I noticed that when I insert a systimestamp value in the column of a table with a timestamp data type, it looks different than

SYSTIMESTAMP.

Query:

{

select order_received_ts from intraday_order where intraday_order_id = 17777
union all
select systimestamp from dual

}

Result:

12/12/2013 12:18:22.655613 PM - 07:00

12/12/2013 12:26:23.914487 PM - 05:00

Because I need to calculate the difference in seconds between the current value of systimestamp and value of the column in the table, I find I have to subtract 2/24 the value column in order to obtain accurate results.

WHERE clause that displays the records that are equal to or exceed the maximum.

{

extract(day from (systimestamp - (nvl(io.order_resubmitted_ts, io.order_received_ts)-2/24))) * 24 * 60 * 60
          + extract(hour from (systimestamp - (nvl(io.order_resubmitted_ts, io.order_received_ts)-2/24))) * 60 * 60
          + extract(minute from (systimestamp - (nvl(io.order_resubmitted_ts, io.order_received_ts)-2/24))) * 60 
          + extract(second from (systimestamp - (nvl(io.order_resubmitted_ts, io.order_received_ts)-2/24))) >= isr.upper_thresh_sla

}

Could someone please help me understand why I do this extra (- 2/24) subtraction?

I noticed that when I insert a systimestamp value in the column of a table with a timestamp data type, it looks different than

SYSTIMESTAMP.
. . .
Could someone please help me understand why I do this extra (- 2/24) subtraction?

Of course - you mix data types.

The value of 'systimestamp' is the TIMESTAMP WITH TIME ZONE data type but the table column datatype is just TIMESTAMP.

Re-create the table and use TIMESTAMP WITH time ZONE TIME and you won't have any adjustments make.

See SYSTIMESTAMP in the Doc of the SQL language

http://docs.Oracle.com/CD/E11882_01/server.112/e26088/functions192.htm

Goal

SYSTIMESTAMPReturns the date system, including the fractions of a second and timezone of the system where the database is located. The return type is TIMESTAMP WITH TIME ZONE .

Tags: Database

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