System Analysis and Design
Positive testing is

testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system
running the system with line data by the actual user
making sure that the new programs do in fact process certain transactions according to Specifications

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System Analysis and Design
Data Definition Language (DDL)

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

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