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Ancestry database records information about family trees. Following information is recorded about each person:
FIRSTNAME first name
SURNAME surname
MNAME maiden name (if applicable)
DOB date of birth
BPLACE place of birth
DOD date of death (if applicable)
DPLACE place of death (if applicable)
SEX male/female
Spouse details:
Father details:
DOD date of death (if applicable) 3
DPLACE place of birth (if applicable)
Mother details:
Part B: Normal Forms
What is OMR? OMR (Optical Mark Recognition) is the translation of marks - or the absence of marks - but not the shape of the mark on forms that have small circles ("also called
For every multivalued attribute 'A', we make a new relation R that contains an attribute corresponding to plus the primary key attribute k of the relation that shows the entity typ
It defines that the tuple in one relation that refers to another relation must refer to an existing tuple in that relation. This constraint is states on two relations (not essentia
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
Shared lock or Read Lock It is requested by a transaction that needs to just read the value of data item. A shared lock on a data item does not permit an exclusive lock
Define the concept of aggregation. Give two examples where this concept is useful. Ans: Aggregation transforms a relationship among the objects into a higher-level object. A
Describe the difference between a one-to-many and a many-to-many relationship. Which logical data structures comprise one-to-many and which comprise many-to-many relationship?
Aggregate functions Some of these functions are min, count, max, and avg. These functions help in getting consolidated information from a set of tuples. Example:
What are stored-procedures? And what are the advantages of using them? Stored procedures are database objects that perform a user defined operation. A stored procedure can have
difference between MIS and DSS
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