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* = PK
@ = FK
^ = Unique
company database
Jim's notes and business rules:
EID is renamed employeeId.
SIN is renamed SSN.
Age is a bad idea, use DOB instead (birthdate)
An address is composed of address1, address2, city, state, zipcode
streetnumber apt or po
Employees are assigned an 8 digit employee number,
department ( departmentId*, name, location, managerId[employeeId]@ ) == or -- employeeId[comment:Department manager]
project ( projectId*, name, budget, departmentId@ )
employee ( employeeId*, firstName, lastName, employeeNumber^, SSN^, address1, address2, city, state, zipcode, birthdate, departmentId@, supervisorId[employeeId]@ )
employeedependent ( employeedependentId*, employeeId@, name, DOB, relationship )
employeephone ( employeeId*@, phone* )
employeedegree ( employeeId*@, degreeId* )
employeesalary( employeeId*, jobName, salary, commission )
employee_project ( employeeId*@, projectId*@, startDate )
customer ( customerId*, CustName )
product ( productId* )
statezipcode ( zip, stateName )
degree ( degreeId*, degreeName^ )
order ( orderId*, customerId@, date )
No nulls in database requires:
employee ( employeeId*, firstName, employeeNumber^, SSN^, address1, address2, city, state, zipcode, salary, birthdate, departmentId@, supervisorId[employeeId]@ )
employeelastname ( employeeId*, lastName )
To fix a null in a query
SELECT SUM(salary) AS payroll
SELECT SUM(Ifnull(salary,0) AS payroll