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A View may be defined of as a virtual table, that is, a table that does not really exist in its own right but is instead inferred from one or more underlying base data table. There is no stored file that direct shows the view instead a definition of view is loaded in data dictionary. Restructuring and growth of base tables is not shown in views. Thus the view may insulate end users from the effects of developing and growth in the database.
What is object containment? References among objects can be used to model dissimilar real-world concepts.
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
What is a candidate key? Minimal super keys are known as candidate keys.
explain the mapping constraints
This assignment is worth 45% of your final grade for this module. Marks will be awarded as follows: Prototypes (wireframe and web based prototype) You are expected
Define instance and schema? Instance: Collection of data kept in the data base at a particular moment is known as an Instance of the database. Schema: The o
What do you mean through integrity constraints? Integrity Constraints -An integrity constraint is a condition specified on a database schema and restricts the data in which
#questiontypes of keys examples..
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
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