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Use the script below to create an updateable view named balance_due_view. Then, create and test an INSTEAD OF trigger named invoices_instead_of_insert that lets the user update the columns in the view by directly updating the Invoices table. Within this trigger, you can call the stored procedure named insert_invoice that's created by the script for figure 15-5
CREATE OR REPLACE VIEW balance_due_view AS
SELECT vendor_name, invoice_number,
invoice_total, payment_total, credit_total,
invoice_total - payment_total - credit_total AS balance_due
FROM vendors JOIN invoices ON vendors.vendor_id = invoices.vendor_id
WHERE invoice_total - payment_total - credit_total > 0;
Write a query to display the last name, department number, and salary of any employee whose department number and salary both match the department number and salary of any employee who earns a commission.
Law Associates is a large legal practice based in Sydney. You have been asked to design a data model for the practice based upon the following specification
Create a trigger named Products_INSERT that inserts the current date for the DateAdded column of the Products table if the value for that column is null. Test this trigger with an appropriate INSERT statement.
Student.txt in the attachment contains the roster of a class. Each student object has the following fields: student id, last name, first name, academic level.Create a RosterClass to store the student database in vector.
Write SQL statement which creates stored procedure with one int input parameter. The stored procedure selects the supplierId field and the total of all Count field values for each group of supplierId's from the Part table.
Write a perl subroutine for temperature conversion named ' convert_temp '. It should be able to handle both Fahrenheit to Celsius conversions as well as Celsius to Fahrenheit conversions.
Write a script that creates and calls a function named fnDiscountPrice that calculates the discount price of an item in the OrderItems table (discount amount subtracted from item price). To do that, this function should accept one parameter for th..
Write a SELECT statement that returns these columns from the CustomerAddresses view that you created in exercise 1: CustomerID, LastName, FirstName, BillLine1.
Create a PL/SQL block to achieve the following using the HR schema and select the name, salary, and department of the employee with the maximum salary.
Write SQL commands which would implement this profile. Next, write query that would list profile, profile resource name, and limit value for the new profile.
Write a SQL statement to display the Major of the student with no duplications. Write a SQL statement to display the First and Last name of students who live in the Zip code 88888.
Write the statement which creates table named Part, with Id field as an int idendity PK, a SupplierId int field, a Description string field of size 25, a Count int field, a Class string field
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