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Introduction to Database System

Introduction to Database System
Given the functional dependency R → (S,T) , then it is also true that R → S.

True
False

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Introduction to Database System
In a _____ a parent record type can be linked to one or more "child" record types, but a child record type can have only one parent.

Hierarchical database
Distributed database
Relational database
Network database

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Introduction to Database System
Which of the following products was the first to implement true relational algebra in a PC DBMS?

dBase-II
R:base
IDMS
Oracle

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Introduction to Database System
In a relation, the rows are sometimes called "records".

False
True

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Introduction to Database System
A key:

can only be one column.
identifies a column.
identifies a row.
must always be composed of two or more columns.

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Introduction to Database System
In an Enterprise-class database system, business users interact directly with database applications that interact with the DBMS, which directly accesses the database data.

True
False

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