Struggling with this one,
Got two tables
Student (national_insurance_nos,name,date_of_birth,room_nos)
ClassRoom (room_nos,builing_name,number_of_seats)
Trigger required for a constraint - number of students cannot be greater than the number of seats in a class room
thanks in advance
SELECT patient_no, room_no, employee_no, department
FROM patient RIGHT OUTER JOIN dentist
ON dentist_no = employee_no
Is there any way to produce a query using UNION for the above statement (no join)
Cheers
PM
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