Introduction to Database System
A good query system

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

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Introduction to Database System
A race condition occurs when

Two concurrent activities interact to cause a processing error
two users of the DBMS are interacting with different files at the same time
Both of the listed here
None of the listed here

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