System Analysis and Design
Data Definition Language (DDL)

describes how data are structured in the data base
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
all of the listed here

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System Analysis and Design
Advantages of Relational Database Management systems are

Flexibility, of relating different logical files
Security controls can be more easily implemented.
None of these
Data independence since it allows the database to grow by adding new attributes and relations.
All of these

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