System Analysis and Design
Data Definition Language (DDL)

specifies for the DBMS what is required; the techniques used to process data
all of the listed here
describes how data are structured in the data base
determine how data must be structured to produce the user's view

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System Analysis and Design
Top-down programming is

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
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

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