Introduction to Database System
A good query system

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

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Introduction to Database System
The activity of a file

None of these
is a low percentages of number of records added or deleted from a file
is a measure of the percentage of existing records updated during a run
if high, reduces processing efficiency for sequential and nonsequential files
refers to how closely the files fits into the allocated

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