Oracle SQL select group function as where clause - sql

Question

I have a simple SQL which result is basic information of employees.
select emp_name, emp_firstname, emp_location, emp_salary from employees e
where e.emp_location = 'XYZ'
Now I ONLY want to get a result of that above mentioned SQL if the sum of ALL employees salary of the location is over 1.000.000 EUR. Otherwise the result should be NULL.
I created a select statement which does analyzes the sum of all employees and returns NULL or the SUM value over 1.000.000 EUR:
select sum(emp_salary) from employees e
where e.emp_location = 'XYZ'
having sum(emp_salary) > 1000000
When I now try to combine both SQL:
select emp_name, emp_firstname, emp_location, emp_salary from employees e
where e.emp_location = 'XYZ'
having sum(emp_salary) > 1000000
I get the error ORA-00937 not a single-group group function

Answer 1

You select non-aggregated fields, but you use no GROUP BY clause. By fixing it, your query should work properly:
SELECT emp_name, emp_firstname, emp_location, SUM(emp_salary) AS emp_salary
FROM employees
WHERE emp_location = 'XYZ'
GROUP BY emp_name, emp_firstname, emp_location
HAVING SUM(emp_salary) > 1000000

Answer 2

Or, if you wish to have sum(emp_salary) by location>1000000, then:
with tb_sal_loc as (
select emp_name, emp_firstname, emp_location, emp_salary
,sum(emp_salary) over (partition by emp_location) loc_salaries
from employees e
where e.emp_location = 'XYZ')
select *
from b_sal_loc
where loc_salaries>1000000;
After your last reply, have you tried the above? This is supposed to do exactly what you have specified in your last reply.

Answer 3

Maybe something like here (10000 limit):
Select EMPNO, ENAME, SAL, LOC, DEPTNO, CASE WHEN DEPT_SAL > 10000 THEN DEPT_SAL END "DEPT_SAL"
From ( Select emp.EMPNO, emp.ENAME, emp.SAL, dept.LOC, dept.DEPTNO, Sum(emp.SAL) OVER(Partition By dept.DEPTNO) "DEPT_SAL"
From emp
Inner Join dept ON(dept.DEPTNO = emp.DEPTNO))
WHERE LOC = 'NEW YORK'
EMPNO ENAME SAL LOC DEPTNO DEPT_SAL
---------- ---------- ---------- ------------- ---------- ----------
7939 HILLER 1300 NEW YORK 10 13850
7934 MILLER 1300 NEW YORK 10 13850
7369 SMITH 800 NEW YORK 10 13850
7902 FORD 3000 NEW YORK 10 13850
7839 KING 5000 NEW YORK 10 13850
7782 CLARK 2450 NEW YORK 10 13850
-- without where condition
Select EMPNO, ENAME, SAL, LOC, DEPTNO, CASE WHEN DEPT_SAL > 10000 THEN DEPT_SAL END "DEPT_SAL"
From ( Select emp.EMPNO, emp.ENAME, emp.SAL, dept.LOC, dept.DEPTNO, Sum(emp.SAL) OVER(Partition By dept.DEPTNO) "DEPT_SAL"
From emp
Inner Join dept ON(dept.DEPTNO = emp.DEPTNO))
EMPNO ENAME SAL LOC DEPTNO DEPT_SAL
---------- ---------- ---------- ------------- ---------- ----------
7939 HILLER 1300 NEW YORK 10 13850
7934 MILLER 1300 NEW YORK 10 13850
7369 SMITH 800 NEW YORK 10 13850
7902 FORD 3000 NEW YORK 10 13850
7839 KING 5000 NEW YORK 10 13850
7782 CLARK 2450 NEW YORK 10 13850
7788 SCOTT 3000 DALLAS 20
7566 JONES 2975 DALLAS 20
7876 ADAMS 1100 DALLAS 20
7654 MARTIN 1250 CHICAGO 30
7521 WARD 1250 CHICAGO 30
7499 ALLEN 1600 CHICAGO 30
7900 JAMES 950 CHICAGO 30
7698 BLAKE 2850 CHICAGO 30
7844 TURNER 1500 CHICAGO 30
... without where condition and without CASE expression:
Select EMPNO, ENAME, SAL, LOC, DEPTNO, DEPT_SAL
From ( Select emp.EMPNO, emp.ENAME, emp.SAL, dept.LOC, dept.DEPTNO, Sum(emp.SAL) OVER(Partition By dept.DEPTNO) "DEPT_SAL"
From emp
Inner Join dept ON(dept.DEPTNO = emp.DEPTNO))
EMPNO ENAME SAL LOC DEPTNO DEPT_SAL
---------- ---------- ---------- ------------- ---------- ----------
7939 HILLER 1300 NEW YORK 10 13850
7934 MILLER 1300 NEW YORK 10 13850
7369 SMITH 800 NEW YORK 10 13850
7902 FORD 3000 NEW YORK 10 13850
7839 KING 5000 NEW YORK 10 13850
7782 CLARK 2450 NEW YORK 10 13850
7788 SCOTT 3000 DALLAS 20 7075
7566 JONES 2975 DALLAS 20 7075
7876 ADAMS 1100 DALLAS 20 7075
7654 MARTIN 1250 CHICAGO 30 9400
7521 WARD 1250 CHICAGO 30 9400
7499 ALLEN 1600 CHICAGO 30 9400
7900 JAMES 950 CHICAGO 30 9400
7698 BLAKE 2850 CHICAGO 30 9400
7844 TURNER 1500 CHICAGO 30 9400