Field with time in minutes and seconds

Dear community,
first of all, I am using Apex 3.1 on Oracle 10g, if this is necessary to know (yes I know, an old version, but given by the company I'm working for). After I've developed a few applications in Apex, thank to the forum and all the answers inside, I came to a problem that I could not solve:
I want to have a normal text field, where the user can enter a duration of an event (e.g. "3:45" or "2:30"). That duration will allways be in the format "MM:SS". No hours, no milliseconds... But how can I save the given values in the database, so in which format? A varchar would be a possibility, but I want to build a report later on, where there is a sum of the times. And how to get a sum of varchar?! But how to make it clear to Apex and Oracle DB that the users gives in a time and not a varchar? The only thing oracle offers is a date field, but I want to save a time and not a date!
Does anybody has a clue for me, cause it seems to me, that possibly I just don't know what I'm searching for, cause people must have had this problem before!?
THanks for your help!
Regards
hoge

But how to make it clear to Apex and Oracle DB that the users gives in a time and not a varchar? The only thing oracle offers is a date field, but I want to save a time and not a date!All APEX items are character strings, so implicit or explicit conversion is required when the values are stored in database columns. For the recommended <tt>INTERVAL DAY TO SECOND</tt> columns, use <tt>TO_DSINTERVAL</tt> to perform the conversion.
Use <tt>EXTRACT</tt> to get the minute and second values from the <tt>INTERVAL</tt> going in the other direction.
but I want to build a report later on, where there is a sum of the times.A user-defined aggregate function can be created to sum <tt>INTERVAL DAY TO SECOND</tt> values: here's an example.
APEX's lack of built-in support for summaries on <tt>INTERVAL</tt> types can be worked round by including the sum in the report query using a </tt>UNION</tt>:
SQL> with test_data as (
2      select
3                rownum n
4              , numtodsinterval(ceil(dbms_random.value(0, 3600)), 'SECOND') t
5      from
6                dual
7      connect
8                by rownum <= 10)
9 select
10            n
11          , t
12          ,    to_char(extract(minute from t))
13            || ':'
14            || to_char(extract(second from t), 'fm00') t1
15 from
16            test_data
17 union all
18 select
19            null
20          , sum_dsinterval(t)
21          ,    to_char(extract(hour from sum_dsinterval(t)))
22            || ':'
23            || to_char(extract(minute from sum_dsinterval(t)), 'fm00')
24            || ':'
25            || to_char(extract(second from sum_dsinterval(t)), 'fm00')
26 from
27            test_data
28 order by
29            1 nulls last
30 /
         N T                              T1
         1 +000000000 00:04:46.000000000 4:46
         2 +000000000 00:07:05.000000000 7:05
         3 +000000000 00:31:11.000000000 31:11
         4 +000000000 00:53:16.000000000 53:16
         5 +000000000 00:19:02.000000000 19:02
         6 +000000000 00:57:12.000000000 57:12
         7 +000000000 00:43:29.000000000 43:29
         8 +000000000 00:03:11.000000000 3:11
         9 +000000000 00:16:40.000000000 16:40
        10 +000000000 00:20:49.000000000 20:49
           +000000000 04:16:41.000000000 4:16:41A custom named column (row) report template with conditional templates can be used to layout and format such a report so that the summary row(s) are properly handled.

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