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sql is relationally complete-justify
WHAT IS MEANT BY E-R MODEL
If R1 and R2 are two relations or functions, then the result of R3 = R1 × R2 is the combination of tuples that are in R1 and R2. The product is associative and commutative. Degr
What is Outer join? They can be employed while we want to keep all the tuples in R, or all those in S or all those in both relations in the result of the JOIN in spite of of w
Describe the Association: Design Before we describe association design let us define association "Association is set of links between two objects in the object model". It is
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
An example of a weak entity is Staff because the availabilityID cannot be uniquely identified unless it is used in conjunction with the foreign key known as availabilityID in the A
example of embedded SQL query
About Attribute inheritance
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