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what are the joins,primary key,foriegn key, candidate key,
super key and expain them?
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Answer Posted / karthik
Join is a keyword which is used to join two or more table.
The unique column in a table is called primary key.
If primary key acting as a normal attribute in some other
table then this attribute is called foreign key.
If table is having more than one unique attribute then the
rest of the attributes of primary key is called candidate key.
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