System Analysis and Design
Advantages of Relational Database Management systems are

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

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System Analysis and Design
Data manipulation language (DML)

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

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