Question
Q1: What is Data-Manipulation Language (DML)? There are four types of access in DML, explain each one. ___________________ Q2: Assume we have a Library Database
Q1: What is Data-Manipulation Language (DML)? There are four types of access in DML, explain each one.
___________________
Q2: Assume we have a Library Database consists of the following relations:
author(author_id, first_name, last_name)
author_publication(author_id, publication_id, author_position)
book(book_id, book_title, month, year, editor)
publication(publication_id, title, book_id)
Note: (editor) in books relation refers to (author_id) in authors relation. Some of authors are book editors.
(a) Underline the appropriate primary keys/foreign keys in the above relations.
(b) Write two relational algebra expressions that retrieve:
-The last names of all authors who are book editors only.
-The first name of all authors who are not book editors.
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