How to substract two date&time values

Well,i just need to substract last visited date&time value from systemdate. The last visited date&time(from the filed named SONBULUNMAZAMANI, ) is selected from table (IHALE_KATILIMCILAR ) in the format DD-MM-RRRR HH24:MI and systemdate is in the same format. And i need to get value in minutes. Then i need to check if the value is greater then 20 minutes, finally i will update database and set IHALE_KATILIMCILAR.AKTIF=0. Here is the code i used;
DECLARE
MinDiff number;
DateTime1 ihale_katilimcilar.sonbulunmazamani%TYPE;
BEGIN
select t.sonbulunmazamani into DateTime1 from ihale_katilimcilar t where t.ihlkodu=141 and t.ihlaltktgkodu=132 and t.id_iliski=193;
MinDiff := ABS( TO_DATE( TO_CHAR(SYSDATE, 'DD-MM-RRRR') || TO_CHAR(SYSDATE , 'HH24:MI'), 'DD-MM-RRRR HH24:MI' ) - TO_DATE( TO_CHAR(DateTime1, 'DD-MM-RRRR') || TO_CHAR(DateTime1, 'HH24:MI'), 'DD-MM-RRRR HH24:MI' ) );
DBMS_OUTPUT.PUT_LINE('Difference is ' || MinDiff);
END;
However the result i get is always pointed values such as ,1895833333333333333333333333333333333333. How can i handle this?
And here is the scripts of table:
create table IHALE_KATILIMCILAR
KULADI VARCHAR2(20),
SONUC NUMBER(1),
AKTIF NUMBER(1) default 1,
SRKTKODU VARCHAR2(10) not null,
SONBULUNMAZAMANI DATE default sysdate,
SIRA NUMBER(1) default 0,
MESAJ VARCHAR2(200),
ID NUMBER(6) not null,
IHLKODU NUMBER not null,
IHLALTKTGKODU VARCHAR2(10) not null,
ID_ILISKI NUMBER,
IHLSIRA NUMBER(1) default 0,
CEVAP VARCHAR2(200)
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('asd', null, 1, '4444', to_date('19-02-2008 10:29:44', 'dd-mm-yyyy hh24:mi:ss'), 0, 'süre talep 2', 76, 145,
'135', 345, 0, 'al sna süre 77');
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('asd', null, 1, '4444', to_date('20-02-2008 14:49:52', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 77, 145, '135',
345, 0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('asd', null, 1, '4444', to_date('19-02-2008 10:29:44', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 78, 145, '135',
345, 0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('asd', null, 1, '4444', to_date('19-02-2008 10:29:44', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 79, 145, '135',
345, 0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KEMMM', null, 0, '42', to_date('17-03-2008 09:29:20', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 63, 141, '134',
191, 0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('MLK', null, 1, '46', to_date('07-03-2008 09:52:20', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 64, 141, '134', 192,
0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KEM.ESM', null, 1, '44', to_date('06-03-2008 13:28:50', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 61, 145, '135',
189, 0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KE.ES', null, 1, '45', to_date('07-03-2008 11:16:41', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 69, 141, '133',
197, 0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KEMMM', null, 0, '42', to_date('17-03-2008 09:29:20', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 65, 141, '132',
193, 1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KE.ES', null, 1, '45', to_date('07-03-2008 11:16:41', 'dd-mm-yyyy hh24:mi:ss'), 2, null, 66, 141, '132',
194, 1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('MLK', null, 1, '46', to_date('07-03-2008 09:52:20', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 67, 141, '132', 195,
1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KEMMM', null, 0, '42', to_date('17-03-2008 09:29:20', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 68, 141, '133',
196, 0, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KEM.ESM', null, 1, '44', to_date('12-03-2008 15:00:58', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 70, 142, '252',
198, 1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KE.ES', null, 1, '45', to_date('10-03-2008 10:08:17', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 71, 142, '252',
199, 1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KEM.ESM', null, 1, '44', to_date('10-03-2008 10:08:56', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 72, 143, '253',
200, 1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('MLK', null, 1, '46', to_date('12-02-2008 13:34:40', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 73, 143, '253', 201,
1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KE.ES', null, 1, '45', to_date('06-03-2008 14:09:40', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 60, 145, '136',
188, 1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KEM.ESM', null, 1, '44', to_date('06-03-2008 13:28:50', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 74, 145, '136',
202, 1, null);
insert into IHALE_KATILIMCILAR (KULADI, SONUC, AKTIF, SRKTKODU, SONBULUNMAZAMANI, SIRA, MESAJ, ID, IHLKODU,
IHLALTKTGKODU, ID_ILISKI, IHLSIRA, CEVAP)
values ('KE.ES', null, 1, '45', to_date('06-03-2008 14:09:40', 'dd-mm-yyyy hh24:mi:ss'), 0, null, 75, 145, '135',
203, 0, null);
Thanks...

What version of SQLServer do you have? Datediff is not an Oracle built-in function.
OP:
THe difference between two dates in Oracle is in days. The decimal portion refers to partial days, so you need to convert that to the required precision. Also, both sysdate and your column are date type, and contain a time portion, so you do not need all the to_date/to_char stuff. Something like:
SQL> SELECT end_dt, start_dt, (end_dt - start_dt) * 24*60 diff
2 FROM (SELECT sysdate end_dt, TRUNC(sysdate) start_dt
3        FROM dual);
END_DT             START_DT                 DIFF
17-mar-08 10:39:39 17-mar-08 00:00:00     639.65John

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set @StartDate = dateadd(day,datediff(day,0,@StartDate),1)
if datepart(weekday,@StartDate) = 7
set @StartDate = dateadd(day,datediff(day,0,@StartDate),2)
-- if @EndDate happens on the weekend, set to previous Saturday 12AM
-- to count all of Friday's hours
if datepart(weekday,@EndDate) = 1
set @EndDate = dateadd(day,datediff(day,0,@EndDate),-2)
if datepart(weekday,@EndDate) = 7
set @EndDate = dateadd(day,datediff(day,0,@EndDate),-1)
declare @return decimal(12,3)
set @return = ((datediff(minute,@StartDate,@EndDate)/60.0) - (datediff(week,@StartDate,@EndDate)*48))
return @return
end
GO
Dan Guzman, SQL Server MVP, http://www.dbdelta.com

How to substract two date&time values

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