Introduction to Database System
In which of the following is a single-entity instance of one type of related to a single-entity instance of another type?

One-to-Many Relationship
One-to-One Relationship
Many-to-Many Relationship
Composite Relationship

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Introduction to Database System
A good query system

None of these
both (a) and (b)
can accept English language commands
allows non-programmers to access information stored in a database
can be accessed only by data processing professionals

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