Question: 3. (a) Please define what a trigger is. If your answer is from the textbook, please state which page of the textbook from which you

(a) Please define what a trigger is. If your answer is from the textbook, please state which page of the textbook from which you got the definition. If your answer is not from the textbook, please also include the complete reference.

(b) Please define what PL/SQL is. If your answer is from the textbook, please state which page of the textbook from which you got the definition. If your answer is not from the textbook, please also include the complete reference.

(c) Please define what a transaction is. If your answer is from the textbook, please state which page of the textbook from which you got the definition. If your answer is not from the textbook, please also include the complete reference.

(d) Please define concurrency control in database operations. If your answer is from the textbook, please state which page of the textbook from which you got the definition. If your answer is not from the textbook, please also include the complete reference.

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