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.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.

Question

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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