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Database Management Systems and Relational Databases: Terms and Concepts, Quizzes of Introduction to Business Management

Virginia Polytechnic Institute and State University (Virginia Tech)Introduction to Business Management

Definitions for key terms related to database management systems (dbms) and relational databases, including database, relational database, primary key, nulls, entity integrity, and referential integrity. Dbmss are used to store complex structured information efficiently and are maintained by dbmss. They support the structural query language (sql) for data access and updates. A relational database stores data based on relationships among data. A primary key is an attribute or a combination of attributes that uniquely identifies each record. Nulls represent an unknown value or attribute, not the same as a zero numeric value or a text string filled with spaces. Entity integrity ensures that table and primary key attributes cannot be null. Referential integrity ensures that the value of a foreign key attribute matches one of the values in the corresponding primary key in its home table or is null.

Typology: Quizzes

2014/2015

Uploaded on 03/22/2015

xjennyxthaix
xjennyxthaix 🇺🇸

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TERM 1
Database
DEFINITION 1
stores complex structured info and makes info retrieval
efficient
maintained by database mgmt systems (DBMSs)
examples are MS Access, SQL Server, Oracle etc.
all DBMSs support the Structural Query Language (SQL)
with which users access and update the data stored in a
database
TERM 2
Relational Database
DEFINITION 2
store data based on relationships among data
TERM 3
Primary Key
DEFINITION 3
an attribute or a combo of attributes that uniquely identify
each record. Duplicate primary key values are not allowed
TERM 4
Nulls
DEFINITION 4
represent an UNKNOWN value or attribute
a value that is NOT APPLICABLE to a particular tuple
not the same as a zero numeric value or a text string
filled with spaces
zeros and spaces are values
null represents absence of a value
TERM 5
Entity Integrity
DEFINITION 5
table, attributes of a primary key can NOT be null
ex: in course table, no records can have a null value for
the courseNo or the sectionNo attribute
pf2

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TERM 1

Database

DEFINITION 1 stores complex structured info and makes info retrieval efficient maintained by database mgmt systems (DBMSs) examples are MS Access, SQL Server, Oracle etc. all DBMSs support the Structural Query Language (SQL) with which users access and update the data stored in a database TERM 2

Relational Database

DEFINITION 2 store data based on relationships among data TERM 3

Primary Key

DEFINITION 3 an attribute or a combo of attributes that uniquely identify each record. Duplicate primary key values are not allowed TERM 4

Nulls

DEFINITION 4 represent an UNKNOWN value or attribute a value that is NOT APPLICABLE to a particular tuple not the same as a zero numeric value or a text string filled with spaces zeros and spaces are values null represents absence of a value TERM 5

Entity Integrity

DEFINITION 5 table, attributes of a primary key can NOT be null ex: in course table, no records can have a null value for the courseNo or the sectionNo attribute

TERM 6

Referential Integrity

DEFINITION 6 value of foreign key attribute must either match one of the values in corresponding primary key in its home table or be null Ex: instructorID in the Course table is foreign key, and its value must either match the value of the instructorID in the Instructor table or be null when no instructor has been assigned to a certain course during, for instance, the registation period