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Consider the following schemas: Employee(staffId, name, salary, depNo) primary key staffId foreign key depNo references Department(depNo) Department(depNo,depname, totalSal) primary key depNo and the following procedural SQL statement: CREATE TRIGGER mystery AFTER INSERT ON Employee FOR EACH ROW IF NOT (NEW.depNo IS NULL) UPDATE Department SET totalSal = totalSal + NEW.salary NEW.depNo WHERE depNo END IF / = Explain what this trigger does without referring to its code. Describe the effect on the database that it has.

Consider the following schemas: Employee(staffId, name, salary, depNo) primary key staffId foreign key depNo references Department(depNo) Department(depNo,depname, totalSal) primary key depNo and the following procedural SQL statement: CREATE TRIGGER mystery AFTER INSERT ON Employee FOR EACH ROW IF NOT (NEW.depNo IS NULL) UPDATE Department SET totalSal = totalSal + NEW.salary NEW.depNo WHERE depNo END IF / = Explain what this trigger does without referring to its code. Describe the effect on the database that it has.

Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter13: Views
Section: Chapter Questions
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Consider the following schemas: Employee(staffId, name, salary, depNo) primary key staffId foreign key depNo references Department(depNo) Department(depNo,depname, totalSal) primary key depNo and the following procedural SQL statement: CREATE TRIGGER mystery AFTER INSERT ON Employee FOR EACH ROW IF NOT (NEW.depNo IS NULL) UPDATE Department SET totalSal = totalSal + NEW.salary NEW.depNo WHERE depNo ENDIF / = Explain what this trigger does without referring to its code. Describe the effect on the database that it has.
Transcribed Image Text:Consider the following schemas: Employee(staffId, name, salary, depNo) primary key staffId foreign key depNo references Department(depNo) Department(depNo,depname, totalSal) primary key depNo and the following procedural SQL statement: CREATE TRIGGER mystery AFTER INSERT ON Employee FOR EACH ROW IF NOT (NEW.depNo IS NULL) UPDATE Department SET totalSal = totalSal + NEW.salary NEW.depNo WHERE depNo ENDIF / = Explain what this trigger does without referring to its code. Describe the effect on the database that it has.
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