objects

identifiers

attributes

entities

implementation

application

design

requirements

they document the physical structure of an existing system or proposed system.

Logical Data flow diagrams typically have lower levels (below the level-0 diagram) to show more details about the processes.

they document the processes in an existing or proposed system.

a logical DFD will remain relatively constrant over time relative is physical nature.

Querie are helpful for finding particular records from a database

SQL is not as flexible as the QBE interface provided by Access

Queries can perform mathematical calculations on the data in a database

A query is essentially a mechanism for extracting data from a database

is an identifier

is multi-value

consists of a group of attributes

describes a characteristic of the relationship

contains entries specifying the different elements of a data flow

All of these answers

a set of rigorous definitions of all DFD data elements and data structures

is a structured repository of data about data

a logical representation of the data of the database

a logical representation of the structure of the database

a physical representation of the structure of the database

a physical representation of the data of the database

action stubs

condition stubs

statements

rulesCâu

views a system as a function that transforms the inputs into desired outputs

shows the flow of data through a system

All of these answers

shows the movement of data through the different transformation or process in the system

data flow

data store

process

source