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The two are synonymous. There is no difference.
#1 primary colors make additive colors
fundamental, main, essential, vital, principal, cardinal, elementary, needed, key, necessary, crucial, primary, classic, plain, simple, unembellished
Any group of keys or columns (may be one or more than one) which can be used to uniquely refer to any row is together called as candidate key.A primary key only one column name which can be used to uniquely refer any row.there is no much difference b/w these two except the number of columns in consideration.
I am supposing that key means primary key.Superkey is any subset of attributes that uniquely identifies the tuples of a relation. This subset need not be minimal, that is, one can remove some attributes from it and it is still uniquely identifying. If all redundant attributes are removed you get a subset what is called primary key.
primary
primary/elementary school
what is the difference between elementary and basic
primary teachers work in elementary schools
elementary or first
Kimberley Tolley has written: 'The art and science connection' -- subject(s): Activity programs, Art, Education, Elementary, Education, Primary, Elementary Education, Primary Education, Science, Study and teaching (Elementary), Study and teaching (Primary)
Secondary School or High School
You can call it either elementary school or primary school.
primary stressed is a syllable in the first second or third
Primary education is the other term for elementary education.
primary, elementary, initial, primitive, fundamental
Grundschule is comparable to elementary school.