Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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CREATE TRIGGER trg_updatecustbalance2
AFTER DELETE
ON INV_MYSQL FOR EACH ROW
UPDATE CUST_MYSQL
SET CUST_BALANCE = CUST_BALANCE - OLD.INV_AMOUNT;
DELETE FROM INV_MYSQL
WHERE INV_NUM = 9006;
SELECT * FROM INV_MYSQL;
 
Here is the question:
 

Write a trigger to update the CUST_BALANCE from CUST_MYSQL when an invoice is deleted from INV_MYSQL. Name the trigger trg_updatecustbalance2.

(You should delete INV_NUM 9006 from INV_MYSQL to ensure your code is correct.)

FIGURE P8.16 CH08_SIMPLECO DATABASE TABLES
Database name: Ch08_SimpleCo
Table name: CUSTOMER
Table name: INVOICE
CUST NUM CUST_LNAME CUST_FNAME CUST_BALANCE
INV_NUM CUST_NUM INV_DATE INV_AMOUNT
1000 Smith
Jeanne
1050.11
8000
1000
23-Mar-16
235.89
1001 Ortega
Juan
840.92
8001
1001
23-Mar-16
312.82
8002
1001
30-Mar-16
528.10
12-Apr-16
23-Apr-16
8003
1000
194.78
8004
1000
619.44
expand button
Transcribed Image Text:FIGURE P8.16 CH08_SIMPLECO DATABASE TABLES Database name: Ch08_SimpleCo Table name: CUSTOMER Table name: INVOICE CUST NUM CUST_LNAME CUST_FNAME CUST_BALANCE INV_NUM CUST_NUM INV_DATE INV_AMOUNT 1000 Smith Jeanne 1050.11 8000 1000 23-Mar-16 235.89 1001 Ortega Juan 840.92 8001 1001 23-Mar-16 312.82 8002 1001 30-Mar-16 528.10 12-Apr-16 23-Apr-16 8003 1000 194.78 8004 1000 619.44
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