Extract hours from time - oracle

Question

I am try to find solution but I couldn't. The problem is following.
1 ) I want to extract hours from time and add minutes converted to hours
(SUM(SUBSTRING_INDEX(aa.Quantity, ':', 1)) + TRUNCATE((SUM(SUBSTRING_INDEX(aa.Quantity, ':', -1)) / 60),0))
So for example If I have 16hours:35minutes. I want to display 16 and minutes part should be added to hours as 16,5 hours for example
2) extract minutes from time and find reminder (modulo)
LPAD((SUM(SUBSTRING_INDEX(aa.Quantity, ':', -1)) % 60), 2, 0)
I found this part of solution but this soulution is wrote in MySQL and I need Oracle SQL solution
CONCAT(
-- extract hours froAm time and add minutes converted to hours
(SUM(SUBSTRING_INDEX(aa.Quantity, ':', 1)) + TRUNCATE((SUM(SUBSTRING_INDEX(aa.Quantity, ':', -1)) / 60),0))
, ':',
-- extract minutes from time and find reminder (modulo)*/
LPAD((SUM(SUBSTRING_INDEX(aa.Quantity, ':', -1)) % 60), 2, 0)
) AS W_TOTAL_SUM
Also I try to convert this MySQL statment to Oracle SQL by using following site, but unfortunettly I didn't get correct result since it returns same output as input
http://www.sqlines.com/online
So exactly same as I decribe but only in Oracle SQL. I would be very thankfull since I try to fix this problem a couple of hours and couldn't find any solution for this problem
Here is my solution which doesn't work. I get error
ORA-00907: missing right parenthesis
SELECT
(SUM(SUBSTR(A.Quantity, ':', 1)) + TRUNC((SUM(SUBSTR(A.Quantity, ':', -1)) / 60),0)), ':' ,
MOD(LPAD(SUM(SUBSTR(A.Quantity, ':', -1)), 60),2,0)
-- MOD(LPAD((SUM(SUBSTRING_INDEX(A.Quantity, ':', -1)) % 60), 2, 0)
-- LPAD((SUM(SUBSTRING_INDEX(aa.Quantity, ':', -1)) % 60), 2, 0)
AS TOTAL_SUM FROM (
SELECT
ata.ATAID AS AtaId, ata.ProjectID, ata.StartDate, ataAW.Quantity
FROM
ata
INNER JOIN
weekly_report
ON
weekly_report.ataId = ata.ATAID
INNER JOIN
ata_articles ataAW
ON
ataAW.wrId = weekly_report.id
WHERE
ata.ATAID = 10987
AND
ataAW.type = 1
OR
ataAW.type = 2
OR
ataAW.type = 3
AND
(weekly_report.status != 3 AND weekly_report.status != 4)
AND
(
weekly_report.year < (SELECT year FROM weekly_report WHERE id = 89)
OR
(
weekly_report.year <= (SELECT year FROM weekly_report WHERE id = 89)
AND
weekly_report.week <= (SELECT week FROM weekly_report WHERE id = 89)
)
)
) A
group by A.AtaId
order by A.AtaId ASC
The common problem is
LPAD((SUM(SUBSTR(A.Quantity, ':', -1)) MOD 60), 2, 0)
Here is output which I expect
TOTAL_SUM
101:24

Answer 1

This is how I understood the question:
sample data in lines #1 - 2
extract hours (line #3)
extract minutes (line #5), divide it by 60 (as number of minutes in an hour)
hours + minutes = result
SQL> with test (col) as
2 (select '16hours:35minutes' from dual)
3 select to_number(regexp_substr(col, '\d+', 1, 1)) -- hours
4 +
5 round(to_number(regexp_substr(col, '\d+', 1, 2)) / 60, 2) -- minutes
6 as result
7 from test
8 /
RESULT
----------
16,58
SQL>