Oracle Interval and Date/Time Conversions. Help!

Question

Hi guys.
I am trying to migrate from MySql to Oracle some queries, but I don't know how works some SQL functions in Oracle.
One of my queries I have to add to a date variable an amount of microseconds, seconds or minutes, in mysql the function is like this:
DATE_FORMAT(LOCALDATE + INTERVAL DeltaT * 1000 MICROSECOND , '%d/%m/%Y %H:%i')
I woud like also convert seconds, minutes, or hours to a Time variable, my example in mysql is like this:
TIME_FORMAT(SEC_TO_TIME(DeltaT div 1000),'%H:%i')
By the way: DeltaT is in seconds and LOCALDATE is a date variable.
I hope you can help me with this.
Thanks.

Answer 1

SQL> CREATE TABLE t (localdate DATE, deltat INTEGER);
Table created.
SQL> INSERT INTO t VALUES (DATE '2006-12-25', 1234);
1 row created.
SQL> INSERT INTO t VALUES (DATE '2006-12-25', 23456);
1 row created.
SQL> alter session set nls_date_format = 'DD-MON-RRRR HH24:MI:SS';
Session altered.
SQL> SELECT localdate
  2       , deltat
  3       , localdate + deltat/86400
  4  FROM   t;
LOCALDATE                DELTAT LOCALDATE+DELTAT/864
25-DEC-2006 00:00:00       1234 25-DEC-2006 00:20:34
25-DEC-2006 00:00:00      23456 25-DEC-2006 06:30:56
2 rows selected.