1 USE Ch®8_SimpleCo 2 3 CREATE TRIGGER trg_updatecustbalance2 4 AFTER DELETE ON INV_MYSQL FOR EACH ROW 5 UPDATE CUST_MYSQL SET CUST_MYSQL.CUST_BALANCE=CUST_MYSQL.CUST_BALANCE-OLD.INV_AMOUNT 6 WHERE CUST_MYSQL.CUST_NUM=OLD.CUST_NUM; 7 DELETE FROM INV_MYSQL WHERE INV_NUM=9Ø06; 8 SELECT FROM INV_MYSQL; 9 SELECT FROM CUST_MYSQL;
1 USE Ch®8_SimpleCo 2 3 CREATE TRIGGER trg_updatecustbalance2 4 AFTER DELETE ON INV_MYSQL FOR EACH ROW 5 UPDATE CUST_MYSQL SET CUST_MYSQL.CUST_BALANCE=CUST_MYSQL.CUST_BALANCE-OLD.INV_AMOUNT 6 WHERE CUST_MYSQL.CUST_NUM=OLD.CUST_NUM; 7 DELETE FROM INV_MYSQL WHERE INV_NUM=9Ø06; 8 SELECT FROM INV_MYSQL; 9 SELECT FROM CUST_MYSQL;
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question
Problem 29
Write a trigger to update the CUST_BALANCE when an invoice is deleted. Name the trigger trg_updatecustbalance2.
(You should delete INV_NUM 9006 from INV_MYSQL to ensure your code is correct.)
Transcribed Image Text:1 USE Ch08_SimpleCo
2
3 CREATE TRIGGER trg_updatecustbalance2
4 AFTER DELETE ON INV_MYSQL FOR EACH ROW
5 UPDATE CUST_MYSQL SET CUST_MYSQL..CUST_BALANCE=CUST_MYSQL.CUST_BALANCE-OLD.INV_AMOUNT
6 WHERE CUST_MYSQL.CUST_NUM=OLD.CUST_NUM;
7 DELETE FROM INV_MYSQL WHERE INV_NUM=9006;
8 SELECT FROM INV_MYSQL ;
9 SELECT FROM CUST_MYSQL;
10
11
12
13
14
15
9 SQL Viewer
ERROR 1064 (42000) at line 8: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server
version for the right syntax to use near 'FROM INV_MYSQL' at line 1
Transcribed Image Text:Expected Results
CUST_NUM
CUST_LNAME
CUST FNAME
CUST_BALANCE
2000
Smith
Jeanne
1050.11
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