SQL query total vs a single value - mysql

Question

I've been working on a query with a peer and it has been turning back some unusual numbers. The query is a productivity report. I'm trying to total the all of the billable units for a specific end user, compare that total to single expected value, and then calculate the difference between those 2 numbers within a 1 week period of time. Here is what we have come up with so far:
SELECT
Employees.emp_id,
Employees.last_name+', '+Employees.first_name as staff_name,
SUM(VisitQuery.billed_value)/60 AS billed_value,
SUM(StandardQuery.num8) as expected_value
FROM
Employees
INNER JOIN
(
SELECT
ClientVisit.duration AS billed_value,
ClientVisit.emp_id,
ClientVisit.client_id
FROM
ClientVisit
WHERE
ClientVisit.non_billable = 0 AND
ClientVisit.rev_timeout >= #param1 AND
ClientVisit.rev_timeout <= #param2
) VisitQuery
ON VisitQuery.emp_id = Employees.emp_id
INNER JOIN
(
SELECT DISTINCT
CaseloadQuery.emp_id,
ClientsExt.num8
FROM
(
SELECT
ClientVisit.duration AS billed_value,
ClientVisit.emp_id,
ClientVisit.client_id
FROM
ClientVisit
WHERE
ClientVisit.non_billable = 0 AND
ClientVisit.rev_timeout >= #param1 AND
ClientVisit.rev_timeout <= #param2
) CaseloadQuery
INNER JOIN ClientsExt
ON CaseloadQuery.client_id = ClientsExt.client_id
) StandardQuery
ON Employees.emp_id = StandardQuery.emp_id
GROUP BY
Employees.emp_id,
Employees.last_name+', '+Employees.first_name`enter code here`
The return comes out looking like this:
emp_id staff_name billed_value expected_value
X X 74 231
XX XX 108 279
XXX XXX 19 72
Does anyone have any thoughts? The expected value should really not be any higher that 40 hours for the week.

Answer 1

In the table ClientVisit, can the same employee (emp_id) has multiple rows that lead to multiple values of client_id? If the answer is yes, then I think you should also do a GROUP BY on client_id
Below I tried rewriting your query (pay attention to the lines marked with "add" and "delete").
Disclaimer: I don't have your actual DB tables to test my query, so it may have syntax and semantic bugs
SELECT
Employees.emp_id,
StandardQuery.client_id, -- add
Employees.last_name+', '+Employees.first_name as staff_name,
SUM(VisitQuery.billed_value)/60 AS billed_value,
SUM(StandardQuery.num8) as expected_value
FROM
Employees
INNER JOIN
(
SELECT
ClientVisit.duration AS billed_value,
ClientVisit.emp_id,
ClientVisit.client_id
FROM
ClientVisit
WHERE
ClientVisit.non_billable = 0 AND
ClientVisit.rev_timeout >= #param1 AND
ClientVisit.rev_timeout <= #param2
) VisitQuery
ON VisitQuery.emp_id = Employees.emp_id
INNER JOIN
(
SELECT DISTINCT
CaseloadQuery.emp_id,
ClientsExt.num8,
ClientsExt.client_id -- add
FROM
(
SELECT
-- ClientVisit.duration AS billed_value, -- delete
ClientVisit.emp_id,
ClientVisit.client_id
FROM
ClientVisit
WHERE
ClientVisit.non_billable = 0 AND
ClientVisit.rev_timeout >= #param1 AND
ClientVisit.rev_timeout <= #param2
)CaseloadQuery
INNER JOIN ClientsExt
ON CaseloadQuery.client_id = ClientsExt.client_id
)StandardQuery
ON Employees.emp_id = StandardQuery.emp_id
GROUP BY
Employees.emp_id,
-- Employees.last_name+', '+Employees.first_name -- delete
StandardQuery.client_id -- add