System Analysis and Design
In Data structure, main characteristic of "ring" is :

None of these
last, record points to the first record
many records point to one record
first record points only to the last record
All of these

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System Analysis and Design
Data manipulation language (DML)

all of the listed here
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

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System Analysis and Design
An open rectangle

represents a process that transforms incoming data flow(s) into outgoing data flows
defines a source or destination of system data
identifies data flow
None of these
is a data store-data at rest, or a temporary repository of data

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