ramesh rammi

ramesh rammi

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Is it any row uniquely identify is superkey

Sep 2 2017 8:07 AM
I have doubt on superkey that is any combination of fields is uniquely identify the

each row or any row in table.

must be each row uniquely identify or any row uniquely identify is superkey
 
Have a look at Superkey - Wikipedia[^]
 
Monarch NameMonarch NumberRoyal House
EdwardIIPlantagenet
EdwardIIIPlantagenet
RichardIIIPlantagenet
HenryIVLancaster
superkeys:
• {}
• {Monarch Name}
• {Monarch Number}
• {Royal House}
• {Monarch Name, Monarch Number}
• {Monarch Name, Royal House}
• {Monarch Number, Royal House}
• {Monarch Name, Monarch Number, Royal House}
 
 according to above example i have doubt  on uniquely identify each row or any row is super key.
 
this example contain in wikipedia site. once check it please 
 
please help me. 
 
 
 
 
 

Answers (1)