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Introduction to Database System

Introduction to Database System
A recursive relationship is a relationship between an entity and ________ .

a subtype entity
itself
an instance entity
an archetype entity

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Introduction to Database System
A relation is a two-dimensional table.

True
False

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Introduction to Database System
Entities can be associated with one another in which of the following?

Attributes
Identifiers
Entities
Relationships

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Introduction to Database System
If a piece of data is stored in two places in the database, then

it can be more easily accessed
storage space is wasted
None of these
both (a) and (b)
changing the data is one spot will cause data inconsistency

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Introduction to Database System
It is more accurate to define a _____ as a variety of different record types that are treated as a single unit

Flat File
None of these
Database
Record
Table

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Introduction to Database System
The modify operation is likely to be done after

Delete
Insert
All of these
None of these
Look-up

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