Define Partial-artificial-alternate-compound
Give a brief explanation of the term partial, artificial, alternate, compound and natural key.
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It is a set and collection of attributes which can uniquely identify weak entities and which are related to equivalent owner entity. It is sometime named as Discriminator.
Alternate Key: All the Candidate Keys without the Primary Key are recognized as Alternate Keys.
Artificial Key: When no obvious key either stands alone or compound is accessible, then the last resort is to easily make a key, through assigning a unique number to each and every record or occurrence. Then this is recognized as developing an artificial key.
Compound Key: When no single data element uniquely determines occurrences in construct, then combining multiple elements to make a unique identifier for construct is recognized as creating a compound key.
Natural Key: If one of data elements kept in a construct is employed as the primary key then it is named as natural key.
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