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Since relation is a set, and tuples are element of a set, according to set theory, the elements of a set are not ordered.

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โˆ™ 2009-05-07 06:01:21
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Q: Why duplicate tuples are not allowed in DBMS?
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In a relation we have number of tuple R ={t1,t2,}, 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

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