How to write a query to get the time difference of two varchar type time columns

Hi,
I want to get the time difference between the two varchar type columns.please see the attached image for more details:
My requirement is like:
timestarted
timeended
timediff
9:00:00
10:00:00
1:00
9:15
9:30:00
0:15

Storing time alone as VARCHAR2 value is a incorrect design. Always store it as DATE or TIMESTAMP.
If you already have a messed up design and cant change it, then you need to convert your VARCHAR2 time into a DATE or TIMESTAMP and find the difference. I have converted it to TIMESTAMP and obtained the difference as INTERVAL.
SQL> with t
2 as
3 (
4 select '09:00:00' timestarted, '10:00:00' timeended from dual
5 union all
6 select '09:15:00' timestarted, '09:30:00' timeended from dual
7 )
8 select timestarted
9       , timeended
10       , (timeended - timestarted) day to second diff
11    from (
12          select to_timestamp('01011900' || timeended, 'ddmmyyyyhh24:mi:ss') timeended
13               , to_timestamp('01011900' || timestarted, 'ddmmyyyyhh24:mi:ss') timestarted
14            from t
15         );
TIMESTARTED                                        TIMEENDED                                          DIFF
01-JAN-00 09.00.00.000000000 AM                    01-JAN-00 10.00.00.000000000 AM                    +00 01:00:00.000000
01-JAN-00 09.15.00.000000000 AM                    01-JAN-00 09.30.00.000000000 AM                    +00 00:15:00.000000
SQL>

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Hi,
806540 wrote:
how to write this query ?
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group by deptno
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                                           FROM          scott.emp
                                           GROUP BY deptno
;

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