SELECT STATEMENT WITH ORDER BY - sql

Question

I have a simple select statement with joins in oracle I have one agregate function like sum(COLUMN) , my query works fine and it return the result , Now I am adding one-two more columns from same table to which I have a join , I am requiring simple column values no agregate function when I add first column it ask me that it needed to be in group by as it is not agregate function I did that , but after doing that i am getting more number of rows which i were getting previously what could be the reason, when I add one more columns than again number of rows increased like with my first query without adding these two columns the result was 544 and now it is 766
select distinct 'carTypes' as type, mi.WOMENNAME as "mother name", mi.womencnic as "mother CNIC", '' as BFORMNO, '' as child_gender, mi.PROVINCE, mi.district, mi.tehsil, mi.HUSBANDNAME, mi.PHONENO contact, mi.address, SUM(p.amount) paid_amount
from MINFORMATION mi
inner join PAYMENTINFORMATION p on p.BENEFICIARYID=mi.WOMENID and p.BANKSTATUS='Successfull'
where mi.month IS NOT NULL
and p.generationdate between '24-JUN-21' and '01-JAN-22'
group by mi.WOMENNAME, mi.womencnic,mi.PROVINCE, mi.district, mi.tehsil, mi.HUSBANDNAME, mi.PHONENO , mi.address
above is my query

Answer 1

That's how it goes. When there's an aggregate function in the select column list all non-aggregated columns must be included in the group by clause (group by, not order by as your title suggests; order by is irrelevant in this matter).
For example, as of Scott's emp table: if you want to compute sum of salaries, the result is only one row:
SQL> select sum(sal)
2 from emp;
SUM(SAL)
----------
29025
If you add deptno column, it means you want to compute sum of salaries per each department. As there are employees from 3 departments, it results in 3 rows:
SQL> select deptno, sum(sal)
2 from emp
3 group by deptno;
DEPTNO SUM(SAL)
---------- ----------
30 9400
20 10875
10 8750
Adding yet another column - job - means that you want to calculate sum of salaries per each department, and per each job within that department; all that increases number of resulting rows:
SQL> select deptno, job, sum(sal)
2 from emp
3 group by deptno, job
4 order by deptno, job;
DEPTNO JOB SUM(SAL)
---------- --------- ----------
10 CLERK 1300
10 MANAGER 2450
10 PRESIDENT 5000
20 ANALYST 6000
20 CLERK 1900
20 MANAGER 2975
30 CLERK 950
30 MANAGER 2850
30 SALESMAN 5600
9 rows selected.
Therefore, what kind of output would you want to get? If you could explain it, maybe we could suggest approach that would make it happen.