How to get this sql query value in oracle query?

Question

Hi all,
i am using one query in sql that is
select @EarlyLeaversMin = DATEDIFF(Minute,@OutTime,@nshiftmax)
suppose first line query is getting 60 minutes.
select @EarlyLeaversMin1=DATEDIFF(Minute,@temphrs,@ShiftTime)
second line query is also getting 60 minutes
set @EarlyLeaversMin=@EarlyLeaversMin+@EarlyLeaversMin1+1
and now here it's calculating both variable minutes and storing in @earlyleaversmin that should store like 60+60+1=121 mintes
select @EarlyLeaverstimeformat = CONVERT(char(8),Dateadd(n,@EarlyLeaversMin,0),108)
so now it will store in this query that value in this format : 01:21:00
can i use the same which it's happening here??
thanks

Answer 1

Oracle handles dates and time very differently from SQL Server (as I gather others on this forum have already tried to explain to you).
Anyway, Oracle does not have a TIME datetype, but what it does have are INTERVALs. In this case you would use INTERVAL DAY TO SECOND. It's not completely clear what you mean by "store in this query that value" but we can use INTERVALS as both table columns and PL/SQL variables.
So your first query would be something like this:
declare
    interval_var  INTERVAL DAY TO SECOND;
begin
     select (nshiftmax - outtime) day to second
     into interval_var
     from whatever;We can do arithmetic with interval variables.
     select (nshiftmax - outtime) day to second +  (shifttime - temphrs) day to second
     into interval_var
     from whatever;To add a hard-coded interval such as 1 minute you can use this functionality:
     interval_var := interval_var + to_dsinterval('0 0:1:0');There's loads of info in the Oracle documentation. [url http://docs.oracle.com/cd/B28359_01/server.111/b28286/sql_elements001.htm#sthref115]Find out more.
Cheers, APC