title: Entity Relationships - Can a weak entity take part in a 'one to many' relationship as the 'one'
body: <p>With the following entity relationship structure I'm struggling to figure out if the relationship between the LOAN and ITEM entities is valid?</p>
  
  <p>The weak entity of LOAN uses a partial key of 'loan_dateLeant' and the primary keys from CUSTOMER and ITEM to form LOANs primary key.
  However LOAN has a 'one to many' relationship with ITEM as a loan can consist of more than one item.
  But surely this means that if more than one item is loaned, then the loan record will have two item_id values for part of its primary key?</p>
  
  <p><img src="https://i915.photobucket.com/albums/ac354/jonoistehdaddy/entityRelationshipModeledit.jpg?t=1268844638" alt="alt text"></p>