System Analysis and Design
Advantages of data base system is (are)

all applications share centralized files
data are stored once in the data base and are easily accessible when needed
storage space duplication is eliminated
all of the listed here

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System Analysis and Design
Top-down programming is

a series or group of components that perform one or more operations of a more complex system
a map of the programmer's view of the data
an approach in which the top module is first tested then program modules are added from the highest level to the lowest level
a group of related fields

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