Using TRUNC in timestamps

Sir,
As you know we were using TRUNC function in DATE datatype. But I want to use it with TIMESTAMP datatypes. For example:
select trunc(systimestamp,'hh24:mi:ss') from dual;
The main idea to get some part of given timestamp without using type conversions (i.e. TO_CHAR).
Note that this is useful when you want to ADD or Subtract the time side from timestamp with interval values and comparing them to another timestamps fields or values.
Thank you in advance.

Trunc is not working in 9i
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
SQL> SELECT current_timestamp - TRUNC (current_timestamp) time
2 FROM dual
3 /
SELECT current_timestamp - TRUNC (current_timestamp) time
ERROR at line 1:
ORA-00932: inconsistent datatypes: expected NUMBER got TIMESTAMP
SQL>
But in 10g...
Personal Oracle Database 10g Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> SELECT current_timestamp - TRUNC (current_timestamp) time
2 FROM dual;
TIME
+000000000 14:53:04.941000
SQL>
Why?

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What about a function based index ?
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Execution Plan
| Id | Operation              | Name           | Rows | Bytes | Cost (%CPU)| Pstart| Pstop |
|   0 | SELECT STATEMENT       |                |     1 |    32 |     4   (0)|       |       |
|   1 | PARTITION RANGE ALL   |                |     1 |    32 |     4   (0)|     1 |     3 |
|   2 |   PARTITION LIST SINGLE|                |     1 |    32 |     4   (0)|   KEY |   KEY |
|   3 |    TABLE ACCESS FULL   | TEST_PARTITION |     1 |    32 |     4   (0)|   KEY |   KEY |
Note
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I have a SQL query that works smoothly. It takes the difference between sets of dates that are >=0 and <=0. here it is:
SELECT createdate, id, objid, start_date, end_date
FROM greggs_date, HNEMap
where active =1
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Hi,
robleh7 wrote:
I have a SQL query that works smoothly. It takes the difference between sets of dates that are >=0 and <=0. here it is:
SELECT createdate, id, objid, start_date, end_date
FROM greggs_date, HNEMap
where active =1
and trunc (createdate-start_date) >=0 and trunc (createdate-end_date) <=0;
Problem is I can't output the differences. In MS SQL Server you can show the number of days difference with the datediff function named in the SELECT part of the SQL statement not so with trunc used to get date differences. How can this query be rework to show the actual days of difference between start and end from create date.
Sorry, I don't understand the problem.
TRUNC (createdate - startdate)    is just a NUMBER. You can display it just like any other NUMBER.
SELECT k.hiredate                         AS base_date
,       d30.hiredate
,       TRUNC (k.hiredate - d30.hiredate) AS dif
FROM        scott.emp k
CROSS JOIN scott.emp d30
WHERE   k.ename        = 'KING'
AND     d30.deptno     = 30
Output:
BASE_DATE   HIREDATE           DIF
17-Nov-1981 20-Feb-1981        270
17-Nov-1981 22-Feb-1981        268
17-Nov-1981 28-Sep-1981         50
17-Nov-1981 01-May-1981        200
17-Nov-1981 08-Sep-1981         70
17-Nov-1981 03-Dec-1981        -16
Post a complete test script (including CREATE TABLE and INSERT statements, if needed) and the results you want from that script.

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Hi Oracle Gurus!
I'm having trouble using select * from as of timestamp.
here is a saml example code:
I use a table like this:
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id number);
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www.ddbcinc.com/askDDBC

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Below is my requirment.How can i achieve this in BMM layer.
CASE WHEN TRUNC(REPORTDATE) <= TRUNC(SYSDATE-2) THEN 1 ELSE 0 END

Try this
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I get this error message saying literal does not match format string every time i type in the simple query below
select trunc(t1.transaction_date) from table_done t1
where trunc(t1.transaction_date, 'YYYY-MM-DD') < '2006-01-01'
and trunc(t1.transaction_date, 'YYYY-MM-DD')>= '2006-12-31';
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I am still new to oracle. thank you

Is t1.transaction_date already a DATE data type? If so all you need to do is apply the TRUNC() function with only the column as the argument which will remove the hour, minute and second components. It looks like some of your post got cut off so I'll guess at what it should be.
SELECT TRUNC(t1.transaction_date)
FROM table_done t1
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// Test.as
package
public class Test { }
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mxmlc Test.as -output case2.swf
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Email:[email protected]

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Thanks..
SQL> define TNAME='PATIENT_AUD'
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The LAG "(&cname, 1, &cname-(1/24/60))" was exactly what I needed in some transaction analysis code I am working on. Thanks 807511
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, get the end_time from the previous record
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Using TRUNC in timestamps

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