okakon
Unknown   India
 
 
bazinga!!!
현재 오프라인
♛︎ KiNG 2018년 8월 14일 오전 5시 05분 
SEM nyc
76561198448738312 2017년 11월 29일 오전 2시 28분 
B***** B******
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2017년 11월 28일 오전 6시 33분 
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Have a good day tomorrow!
76561198448738312 2017년 11월 28일 오전 1시 27분 
i love you
vizal96 2017년 11월 25일 오전 5시 22분 
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_***______SORRY FOR_____***_
_***_______GETTING_______***_
__***________YOU________***__
___***____PREGNANT___***____
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2017년 11월 24일 오전 12시 57분 
A superkey is a set of one or more attributes that, taken collectively, allow us to identify uniquely a tuple in the relation. For example, the ID attribute of the relation instructor is sufficient to distinguish one instructor tuple from another. Thus, ID is a superkey. The name attribute of instructor, on the other hand, is not a superkey, because several instructors might have the same name.