6-3. Converting a Number to a String
Problem
You need to alter some numbers into a currency format for display. Given a set of numbers, your application will perform a calculation and then convert the outcome into currency format, which will be a string type.
Solution
Use the TO_CHAR conversion function to obtain a nicely formatted currency string. The following code block accepts a number, performs a calculation, and then converts the number to a string:
CREATE OR REPLACE FUNCTION CALCULATE_BILL(bill_amount IN NUMBER)
RETURN VARCHAR2 AS
tax NUMBER := .12;
tip NUMBER := .2;
total_bill NUMBER := 0;
BEGIN
total_bill := bill_amount + (bill_amount * tax); total_bill := total_bill + ...Get Oracle and PL/SQL Recipes: A Problem-Solution Approach now with the O’Reilly learning platform.
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