Database | Database management systems homework help

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How do you use a SELECT command that retrieves more than one row in a PL or SQL procedure?
Which PL or SQL command selects the next row in a cursor?
What are the disadvantages and advantages of databa
(a) Is a database management system hardware or software? (b) What is its use?
A combination of several columns that together serve as the primary key is called what? (a) foreign key (b) composite key (c) candidate key.
What is data virtualization?
What are the disadvantages of adding indexes to a database table?