relational and e-r modelthere are three types of
Relational and E-R Model
There are three types of constraints on relational database that have:
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in a relation tuples are not inserted in any definite order ordering of tuples is not defined as a part of a relation definition though records may
a super key is an attribute or set of attributes used to recognize the records uniquely in a relationfor instance in the relation person defines
super keys of a relation can have extra attributes candidate keys are minimal super key ie such a key have no extraneous attribute an attribute is
relational and e-r modelthere are three types of constraints on relational database that have domain constraint primary key constraint integrity
domain constraintit shows that each attribute in a relation has to contain an atomic value only from the corresponding domains the data types
mergers and acquisitions play a critical part in a corporations survival growth and profit strategies many great companies were built on a track
this constraint shows that the key attribute value in each tuple must be unique ie no two tuples have the similar value for the key attribute this is
it is the year 2012 the chief executive of xyz systems plc a growing firm in the telecommunication sector has called your team for an important
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