System Analysis and Design
Advantages of Relational Database Management systems are

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

ANSWER DOWNLOAD EXAMIANS APP

System Analysis and Design
Data Definition Language (DDL)

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

ANSWER DOWNLOAD EXAMIANS APP