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For every n-ary relationship type R where n>2, we make a new table S to represent R. We contain as foreign key attributes in s the primary keys of the relations that show the participating entity types. We also contain any easy attributes of the n-ary relationship type (or easy components of complete attributes) as attributes of S. The primary key of S is generally a combination of all the foreign keys that reference the relations showing the participating entity types. Figure is a special case of n-ary relationship: a binary relation.
what should be included in this???
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
The clause in SQL which specifies that the query result should be sorted in ascending or descending order based upon the values of one or much more columns is Ans : Order by
Determine the concept of Process Process: A process transforms the data values. It is represented as ellipse containing a description of transformation. Each procedure has a
Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
What is substitutability? Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, a
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
Describe Hashing in DBMS? Hashing: Hashing is a technique to store data within an array so which storing, searching, inserting and deleting data is fast (in theory it's O(1))
does tables are called relations
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