I have this and it is not showing as correct: 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_u
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
I have this and it is not showing as correct:
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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3b25ca7f-17ae-46a9-a0fa-246f9e8efe16%2F6d1ff506-287a-4edd-86a9-eef28c1971d3%2F0d155nt_processed.png&w=3840&q=75)
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