System Analysis and Design
The four icons used in building Data Flow Diagram are

Flow, Process, Source, Store
Source, Process, Destination, Store
None of these
Flow, Process, Source/Destination, Store
Flow, Source, Store, Process

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System Analysis and Design
Data manipulation language (DML)

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
determine how data must be structured to produce the user's view

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