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Why is database redesign necessary?
Database redesign is essential for two reasons. First, redesign is essential both to fix mistakes made during the initial database design. Second, redesign is needed to adapt the database to changes in system requirements. Such alters are common because information systems and organizations do not just influence each other they make each other. Thus, new information systems cause alters in systems requirements.
Give the forms of triggers? The triggering event can be insert or delete. For updated the trigger can state columns. The referencing old row as clause The referencing
Consider the subsequent relation schemes: Project (Project#, Project_name, chief_architect) Employee (Emp#, Empname) Assigned_To (Project#, Emp#) Give expression i
A B-tree of order how much children m has maximum ? m has maximum m mchildren in a B tree.
Explain the benefit of OOM. Main benefits of object oriented modeling are development of system become fast, quality of the system get improve. It gives freedom of use of alrea
The Second Normal Form (2NF) Definition: A relation is in 2NF if it is in 1NF and each non-key attribute is fully dependent on each candidate key of the relation. Some of th
how to implement mid square hashing?
What is De-normalization? De-normalization is the method of attempting to optimize the performance of a database by adding redundant data. It is sometimes essential because cur
The database is to record information about artists for a (music) production company. An artist is the name of a singer or band; the name of the artist, the year the artist started
What is Nested Queries explain in details? Nested Queries - A SELECT query could have subquery(s) in it. While a SELECT query having another SELECT query in it, is known as n
(a) Why did SAP introduce the extended star schema?
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