How design Employee table for many phone numbers? -


let's you're designing employee table , have accommodate different phone numbers.. home, work, , cell suppose there others in future. let's business cares know kind of cell phone each employee uses. how design it?

here's denormalized way. simple, means adding column new phone type:

employee

  • employeeid
  • employeelastname
  • employeefirstname
  • employeehomephone
  • employeeworkphone
  • employeecellphone
  • cellphoneid

cellphone

  • cellphoneid
  • cellphonemake
  • cellphonemodel

here's more normalized/extensible way, there's figuring out put cellphone make/model info phone numbers of type = cell (but not type = home or work):

employee

  • employeeid
  • employeelastname
  • employeefirstname

employeephone

  • employeephoneid
  • employeephonenumber
  • phonetypeid

phonetype

  • phonetypeid
  • phonetypename
  • cellphonetypeid <-- that's null non-cell numbers? seems bad design.

my tendency lean toward extensible (though more complex) toward simple (but less extensible), here i'm not sure.. when consider employee never have 1 of each type of phone. if go extensible, future code can't make assumption , have accommodate possibility of multiple numbers of same type (which isn't realistic).

thanks thoughts.

employee
employeeid
employeelastname, employeefirstname

phone
phoneid
phonetypeid, phonenumber

phonetype
phonetypeid
phonemake, phonemodel

employeephone
employeeid, contact
phoneid, notes

where i'd recommend phonetype dropped altogether. realistically, it's not relevant - , it'll become filled stale garbage. can't see high-power executive going feel need bother informing of details of latest toy. after all, should know automatically, shouldn't they?

i'd add contact field - look, i'm not on field names, ok? mean reason contact 'work' or 'home' or 'weekends' or 'golf club (thursdays)' or whatever. notes used - notes, ask jacinta if contact 'medical emergency' instance.

as having multiple phones - doctor know carries 3 cellphones - that's in addition office phone, practice phone, @ least 2 office-in-hospital phones, public phone-at-home , privae phone-at-home (and multiple homes well...) it's wonder can remember of numbers...


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