What is a broad definition of data?
Raw facts that are captured on printed or digital media
What are data?
Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data?
It does not follow a data model.
Which is true about...
What is a broad definition of data? - ANSWER- Raw facts that are captured on
printed or digital media
What are data? - ANSWER- Facts that are collected and stored in a database
system
What is a determining characteristic of unstructured data? - ANSWER- It does not
follow a data model.
Which is true about flat files? - ANSWER- They contain no internal hierarchical
organization.
Which technology has no internal hierarchy? - ANSWER- Flat files
How were data retrieved before database management systems? - ANSWER-
Sequentially from simple files
In which two ways does a database management system environment increase
effectiveness in working with data? - ANSWER- - It enables data sharing,
- It permits storage of vast volumes of data.
What is the uniquely identifiable element about which data can be categorized in
an entity-relationship diagram? - ANSWER- Entity types
Which classification is correct for the box marked "Quantity" in the given entity-
relationship diagram? - ANSWER- Intersection data
Which data classification is an entity? - ANSWER- Event
, A salesperson is authorized to sell 12 products; a product can be sold by 10
salespersons.
Which kind of binary relationship is described in this example? - ANSWER- Many-
to-many
Which three kinds of rules for referential integrity are provided by modern
relational database management systems? - ANSWER- Insert, Delete, Update
What is an important aspect of "referential integrity"? - ANSWER- Reference to
data in one relation is based on values in another relation.
Sales data, detailing the customer names, products sold, and salespersons, is
kept in a database.
Which kind of data in this database would qualify as intersection data related to
both the product and salesperson entities? - ANSWER- Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a
relation? - ANSWER- Primary key
What is necessary for a primary key in one relation of a database to match with
its corresponding foreign key in another relation of the same database? -
ANSWER- A domain of values
What uniquely identifies each entity in a collection of entities but is not the
primary key? - ANSWER- The alternate key
What is a term for a set of columns in a table that can uniquely identify any record
in that table without referring to other data? - ANSWER- Candidate key
What happens to the original data in database indexing? - ANSWER- It is copied
to the index.
Why are indexes created in a physical database design? - ANSWER- To retrieve
data directly using a pointer.
Why is an index created on a database column? - ANSWER- To optimize data
retrievals
Refer to the given SQL statement.
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