Christopher - 28 days ago 4x
SQL Question

SQL - Using Sum command multiplies the salary for the same person

I'm trying to increase the salary for those employees who treat at least 2 patients by 10%. My problem is that the salary first multiplies by 2 for every patient they treat and then multiplies by 10% at the end. For exampel if the employee earns 25.000 and treats 3 people the new salary becomes 82.500.

``````select distinct t.empNbr, e.Salary, sum(e.Salary*1.1) as NewSalary from Treats t
inner join Employee e
on e.empNbr=t.empNbr
WHERE t.empNbr IN
(
SELECT empNbr
FROM Treats
GROUP BY empNbr
HAVING COUNT(*) >= 2)
group by t.empNbr, e.Salary
``````

CROSS APPLY should help:

``````SELECT  e.empNbr,
e.Salary,
e.Salary*1.1 as NewSalary
FROM Employee e
CROSS APPLY (
SELECT  empNbr
FROM Treats
WHERE e.empNbr = empNbr
GROUP BY empNbr
HAVING COUNT(*) > 1
) as t
``````

The `t` part gets `empNbr` we need. Then we select `empNbr` and `salary` from `Employee` table and do math :)

One more way:

``````SELECT  TOP 1 WITH TIES
e.empNbr,
e.Salary,
e.Salary*1.1 as NewSalary
FROM Employee e
INNER JOIN Treats t
ON e.empNbr = t.empNbr
ORDER BY
CASE WHEN COUNT(t.empNbr) OVER (PARTITION BY t.empNbr ORDER BY t.empNbr) > 1 THEN 1 ELSE 0 END DESC,
ROW_NUMBER() OVER (PARTITION BY t.empNbr ORDER BY t.empNbr)
``````