what is a primary keyprimary key is chosen by the
What is a primary key?
Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
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q what is the kind of circulatory system present in annelidsin beings of the phylum annelida the circulatory system is closed that is blood
define tuple variabletuple variable is a type of variable whose domain is the set of all
define the term domainfor each n every attribute there is a set of permitted values known as the domain of that
what is a candidate keyminimal super keys are known as candidate
what is a primary keyprimary key is chosen by the database designer as the principal means of identifying an entity in the entity
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what is a super keya super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity
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what is a select operationthe select operation selects tuples that please a given predicate we use the lowercase letter sigma to denote
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