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
determine how data must be structured to produce the user's view
describes how data are structured in the data base

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System Analysis and Design
System prototyping helps the designer in

communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
giving a demo of the software, to the system manager to whom he reports
making the programmers understand how the system will function.
all of the listed here

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