title: ER Modelling Question
body: <p>I have the following question:</p>
  
  <p>Using only binary relationships, construct an entity relationship diagram for the following description. Include entity labels, primary key fields, relationship labels, and the multiplicities on relationships. </p>
  
  <p>"A company runs several car repair and service garages, each having its own unique number (gargNo). When a car owner contacts a garage, their details are recorded and they are assigned an ownerNo. Their car is also registered with that garage and is assigned a reference number (carNo). An owner may own one or more cars, but a car can only be registered with one garage. When a car is booked into a garage, a service plan is drawn up for it. The service plan may be unique for a particular car (eg, cure squeaking windscreen wipers) or it may be one used for many cars (eg, a standard 60000 mile service). Any service plan can consist of one or more operations (change the oil, dismantle the wiper motor, etc). Each type of operation on a service plan has a unique number (operationNo).</p>
  
  <p>This is my answer:</p>
  
  <p><img src="https://i.stack.imgur.com/ijdsc.gif" alt="enter image description here"></p>
  
  <p>For all Database veterans, does this look ok to you?</p>
  
  <p>Also any other comments feedback would be appreciated...</p>
  
  <p>NOT HOMEWORK</p>
  
  <p>EDIT - Why do people keep editing posts but making no changes?</p>