System Analysis and Design
A self check digit is useful in detecting

None of these
transcription errors only
All of these
transposition errors only
Random errors only

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System Analysis and Design
Data manipulation language (DML)

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

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System Analysis and Design
Positive testing is

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

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