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subramanyam Rsubramanyam R 

how we know the a relationship is a lookup or master relationship in apex and vf page?

Master -Detail:
  • The Master -Detail field is required on all Vf Page.
  • we can not update Master - detail field using apex but we can clone it.
Look - up:
  •  Look-up field is not required field in Vf page.
  • We can update look-up field using apex