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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)
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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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.)

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: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
Expected Results CUST_NUM CUST_LNAME CUST FNAME CUST_BALANCE 2000 Smith Jeanne 1050.11
Transcribed Image Text:Expected Results CUST_NUM CUST_LNAME CUST FNAME CUST_BALANCE 2000 Smith Jeanne 1050.11
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