System Analysis and Design
Data Definition Language (DDL)

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

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System Analysis and Design
Advantages of Relational Database Management systems are

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

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