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Whst is logical schema ?
Logical schema is the entire database.
What is NULL? Simply NULL means not in value.
A database administrator''s responsibilities and data contents
Illustrate the collaboration and relationship diagram A collaboration is the society of interfaces, classes and other elements which work together to provide some cooperative b
a project based on normalization with first, second and third normalization. There need to be a diagram also
What are the problems if one were not to normalize? When do these problems surface? Ans: Database normalization, sometimes considered to as canonical synthesis, is
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
Describe identifying relationship? Identifying relationship: It is relationship among strong entity and a weak entity it is represented through a doubly outlined diamond in C
Wait-die" scheme : The idea is based on non-preventive method. It is based on a simple rule: If Ti requests a database resource that is held by T
4. Describe three ways to handle missing field values
What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set. Disjoint less constraint needs that an entity belongs to
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