DATE in TIMESTAMP data type conversion

Hello

My question is this:

1. I have a variable of type DATE, which I attribute the value of SYSDATE
 mydatevar DATE:= SYSDATE;
2. I want to find * «today» *, truncated to DATE
  TRUNC (mydatevar, 'DD')
TRUNC function returns the DATE data type. So I get to the point for example 2 *'2010-01-13 00:00:00 ' *.

3. I want to assign the value of the point 2, to a variable of type TIMESTAMP
  mytimestampvar TIMESTAMP := mydatevar;
implicitly that will convert the variable DATE to TIMESTAMP.

Problem: when converting (implicit and explicit conversion with a format mask), I lose hours "00" and "00" minutes and receive something like this: "10 January 13 * 12 *. 00.00.000000000 AM.

Question: How can I convert a DATE to TIMESTAMP keeping the hours and minutes zeros?

Why I need this conversion: I have a table with one "column1" TIMESTAMP column (0) and I take only the rows of the table, where 'column1' is in the range of today 12:00 in the morning until now (what time it is).

Features of the database NLS:
PARAMETER                           VALUE
NLS_LANGUAGE                           AMERICAN
NLS_TERRITORY                   AMERICA
NLS_CURRENCY     $
NLS_ISO_CURRENCY                    AMERICA
NLS_NUMERIC_CHARACTERS     .,
NLS_CHARACTERSET                    AL32UTF8
NLS_CALENDAR                            GREGORIAN
NLS_DATE_FORMAT                    DD-MON-RR
NLS_DATE_LANGUAGE            AMERICAN
NLS_SORT     BINARY
NLS_TIME_FORMAT                     HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT             DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT             HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT     DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY              $
NLS_COMP                             BINARY
NLS_LENGTH_SEMANTICS               BYTE
NLS_NCHAR_CONV_EXCP             FALSE
NLS_NCHAR_CHARACTERSET     AL16UTF16
NLS_RDBMS_VERSION             10.2.0.4.0
Session settings are the same.

DBTIMEZONE is "+ 02:00".

Verdi wrote:
Problem: when converting (implicit and explicit conversion with a format mask), I lose hours "00" and "00" minutes and receive something like this: "10 January 13 * 12 *. 00.00.000000000 AM.

I don't think you lose necessarily any information whatsoever. It is probably more a function of your NLS_TIMESTAMP_FORMAT and NLS_DATE_FORMAT. For example, your NLS_DATE_FORMAT could be default setup for a HH24 (24 hours) which would report to midnight as hours of "00". However, it seems that your NLS_TIMESTAMP_FORMAT is configured with "HH" format with a Meridian indicator that means 12 hours time.

Your comparisons should use date/timestamp data types anyway, so as long as the input value is correctly converted to date type that shouldn't matter in any case.

You can see what is actually stored by using the DUMP function:

SQL> SELECT  DUMP(TO_TIMESTAMP(TO_CHAR(TRUNC(SYSDATE,'DD'),'MM/DD/YYYY HH:MI:SS AM'))) AS TSTAMP
  2  ,       DUMP(TRUNC(SYSDATE,'DD')) AS DT
  3  FROM DUAL
  4  /

TSTAMP                                                                      DT
--------------------------------------------------------------------------- --------------------------------------------------
Typ=187 Len=20: 218,7,1,13,0,0,0,0,0,0,0,0,0,0,3,0,0,0,0,0                  Typ=13 Len=8: 218,7,1,13,0,0,0,0

As you can see the TSTAMP and DT store almost the same values (218,7,1,13), but the TSTAMP has more precision because of fractions of a second.

HTH!

Published by: Centinul on January 13, 2010 07:23

Tags: Database

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