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Create a stored procedure named prc_inv_amounts to update the INV_SUB-TOTAL, INV_TAX, and INV_TOTAL. The procedure takes the invoice number as a parameter. The INV_SUBTOTAL is the sum of the LINE_TOTAL amounts for the invoice, the INV_TAX is the product of the INV_SUBTOTAL and the tax rate (8 percent), and the INV_TOTAL is the sum of the INV_SUBTOTAL and the INV_TAX.

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Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482

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Chapter
Section
BuyFindarrow_forward

Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482
Chapter 8, Problem 30P
Textbook Problem
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Create a stored procedure named prc_inv_amounts to update the INV_SUB-TOTAL, INV_TAX, and INV_TOTAL. The procedure takes the invoice number as a parameter. The INV_SUBTOTAL is the sum of the LINE_TOTAL amounts for the invoice, the INV_TAX is the product of the INV_SUBTOTAL and the tax rate (8 percent), and the INV_TOTAL is the sum of the INV_SUBTOTAL and the INV_TAX.

Program Plan Intro

Stored procedures:

  • A procedure is a collection of procedural and SQL statements.
  • A procedure may have input parameter, output parameter and both parameters.
  • It has a declared with a unique named with a unit of procedural code using the proprietary RDBMS and it is invoked by a host language library routine.

Example code for stored procedure:

Code to create a stored procedure:

CREATE PROCEDURE SW_Supply as select S.SUP_NAME, S.SUP_MAIL from SUPPLIERS S;

Explanation:

  • From the above query the stored procedure “SW_Supply” is created to display the supplier details when executing the procedure.

Code to execute a stored procedure:

Statement stmt = con.createStatement();

stmt.executeUpdate(createProcedure);

Explanation:

  • The above code is used in the programming language to execute the stored procedure.

Explanation of Solution

Query to create stored procedure for “CUSTOMER” table:

CREATE OR REPLACE PROCEDURE PRC_INV_AMOUNTS (W_IN IN NUMBER) AS

W_CHK  NUMBER := 0;

W_SUBT NUMBER := 0;

W_TAX   NUMBER := 0;

BEGIN

-- VALIDATE INVOICE NUMBER

SELECT COUNT(*) INTO W_CHK FROM INVOICE

WHERE INV_NUMBER = W_IN;

IF W_CHK = 1 THEN

SELECT SUM(LINE_TOTAL) INTO W_SUBT FROM LINE

WHERE LINE.INV_NUMBER = W_IN;

W_TAX := W_SUBT * 0.08;

UPDATE INVOICE

SET INV_SUBTOTAL = W_SUBT,

INV_TAX = W_TAX,

INV_TOTAL = W_SUBT + W_TAX

WHERE INV_NUMBER = W_IN;

END IF;

END;

/

Explanation:

  • The above query is used create a procedure “PRC_INV_AMOUNTS” to update the “INV_SUBTOTAL” with the values with sum of “LINE_TOTAL”,  “INV_TAX” with the values with “W_SUBT * 0...

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Chapter 8 Solutions

Database Systems: Design, Implementation, & Management
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