Date functions in Oracle

Question

Hello
I need to rewrite the following sql I used in MSSQL server to sql for Oracle:
declare @lastmo_start datetime,
     @lastmo_end datetime
select @lastmo_start = dateadd(month, -1, getdate())
select @lastmo_end= dateadd(day, -1, getdate())
Basically I need to declare 2 variables and then set those values to the first day of the month and the last day of the same month.I will use these variables later in my script.
How I can do this in Oracle?
Thank you,
Lena

Answer 1

This syntax doesn't work.Do you mean it hurls an exception or just doesn't return the expected result? Please describe the expected and actual behaviour, with error messages if appropriate. Because it ought to work...
SQL> select * from dds;
        ID SDATE     EDATE
         1 11-FEB-06 11-MAR-06
         2 06-APR-06 11-APR-06
         3 11-APR-06 11-MAY-06
SQL> set serveroutput on
SQL> declare
  2    d1 date := trunc(sysdate, 'MM');
  3    d2 date := last_day(sysdate);
  4  begin
  5    for r in ( select * from dds
  6               where sdate >= d1 and edate <= d2 )
  7    loop
  8       dbms_output.put_line(r.id||'::'||r.sdate||'::'||r.edate);
  9    end loop;
10  end;
11  /
2::06-APR-06::11-APR-06
PL/SQL procedure successfully completed.
SQL> Cheers, APC