To rename the 'isFriend' attribute to 'isBusinessContact' in a relation, ρ isBusinessContact / isFriend ( addressBook ) {\displaystyle \rho _{\text{isBusinessContact / isFriend}}({\text{addressBook}})} might be used.
Како би се у релацији атрибут „isFriend” преименовао у „isBusinessContact”, може се употријебити ρ isBusinessContact / isFriend ( addressBook ) {\displaystyle \rho _{\text{isBusinessContact / isFriend}}({\text{addressBook}})} .