Duplicate tuples not allowed in a relation?
In a relation we have number of tuple R ={t1,t2,t3.....tn}, nd
they follow integrity constraints nd each tuple has a primary key
pk.if any of the d two tuple have same attribute. for instance
t1=t2 then its pk wud be same too.. but this violates the key
constraint..
hence duplicacy not allowed in tuple...
enjoy
Rijo Rajan