SQL Query with multiple conditions not working - mysql

Question

Okay so this is my best attempt at making a query. It currently executes but returns nothing the other attempts have not worked.
The joins are wrong I believe and I'm not sure how to fix them or do this right
In this query I am trying to get the activity details with staff assigned to those activities matching all conditions below.
The staff and activities are linked in the Allocation table with a Staff ID assigned to an Activity ID there.
--Teach at least 2 modules during 2019 in a certain campus
The staffID must occur at least twice in the Teach table at the field StaffID
The spaID 5 or 6 would correspond to the campus so teach two modules at this time and ID.
--Supervise more than 1 colleagues
This is in the staff table with SupervisorID being a foreign key of StaffID in the same table.
So the Staff ID allocated to the activity needs to supervise more than one colleague with their ID appearing in SupervisorID more than once.
--The related activity is internal one
The activity is internal if it equals to 1.
So to sum it up the activity details should only appear in the query results if it has staff matching all the conditions above
SELECT Activity.AcID, Activity.Title, Activity.CaID, Activity.Internal, Activity.BuID, Budget.Amount FROM Activity
INNER JOIN Budget ON Activity.AcID = Budget.BuID
INNER JOIN Allocation ON Activity.AcID = Allocation.AcID
INNER JOIN Staff ON Allocation.StaffID = Staff.StaffID
INNER JOIN Teach ON Allocation.StaffID = Teach.StaffID
WHERE Activity.Internal=1 AND
Allocation.StaffID IN (
SELECT Staff.SupervisorID
FROM Staff
GROUP BY StaffID
HAVING COUNT(Staff.SupervisorID=Allocation.StaffID) >1)
AND Allocation.StaffID IN (
SELECT Teach.StaffID
FROM Teach
WHERE Teach.Year='2019' AND Teach.SpaID=5 OR 6
GROUP BY Teach.StaffID
HAVING COUNT(Allocation.StaffID=Teach.StaffID) >=2);
Table details are below if you want to look at them for more details
Table Activity -- AcID, Title, CaID, BuID, Status, Started, Ended Internal
Table Allocation -- StaffID, AcID
Table Budget -- BuID, Amount, Approver, Payee, Status
Table Campus -- CaID, Address, GmName, Country, Status
Table Classroom -- RmID, Capacity, CaID, Location, Type, Status
Table Module -- ModuleID, Module Name, DeptID, Programme, TMode, Date_of_Firstoffer
Table SpaceAssign -- SpaID, RmID, TID, Manager, Approved
Table Staff -- StaffID, Title, FirstName, LastName, DeptID, CaID, Joined, LeftD, Current, Salary, ContractType, SupervisorID
Table Teach -- TID, ModuleID, StaffID, SpaID, Semester, Year
I have tried my best to explain this well sorry for any confusion.

Answer 1

Without data It's very tough to find a solution. Please try this:
SELECT Activity.AcID, Activity.Title, Activity.CaID, Activity.Internal, Activity.BuID, Budget.Amount FROM Activity
INNER JOIN Budget ON Activity.AcID = Budget.BuID
INNER JOIN Allocation ON Activity.AcID = Allocation.AcID
INNER JOIN Staff ON Allocation.StaffID = Staff.StaffID
INNER JOIN Teach ON Allocation.StaffID = Teach.StaffID
WHERE Activity.Internal=1 AND
Allocation.StaffID IN (
SELECT Staff.SupervisorID
FROM Staff
GROUP BY SupervisorID
HAVING COUNT(*) >1)
AND Allocation.StaffID IN (
SELECT Teach.StaffID
FROM Teach
WHERE Teach.Year='2019' AND Teach.SpaID=5 OR 6
GROUP BY Teach.StaffID
HAVING COUNT(*) >=2);

Answer 2

It is hard to tell without having access to the data but you can try to change the inner joins to left joins and also:
This
WHERE Teach.Year='2019' AND Teach.SpaID=5 OR 6
Should be
WHERE Teach.Year='2019' AND (Teach.SpaID=5 OR Teach.SpaID=6)
This looks incorrect as well:
INNER JOIN Budget ON Activity.AcID = Budget.BuID
Should be:
INNER JOIN Budget ON Activity.BuID = Budget.BuID