4. Write a query to count the number of invoices.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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quetion 4

Transcribed Image Text:4. Write a query to count the number of invoices.

Transcribed Image Text:Part 1:
CUSTOMER
CUST_NUM
CUST_LNAME
CUST_FNAME
CUST_BALANCE
1000
Billy
Jean
1050.11
1001
Amanda
John
840.92
INVOICE
INV DATE
23/3/2020
INV_NUM
CUST_NUM
INV_AMOUNT
8000
1000
235.89
8001
1001
23/3/2020
312.82
8002
1002
30/3/2020
528.10
8003
1003
12/4/2020
194.78
8004
1004
23/4/2020
619.44
1. Create both the CUSTOMER and INVOICE tables structure above. Details of both tables are:
a) The customer number should store integer values. The name attributes should support variable
length character data up to 30 characters each. The customer balance should support up to six digits on
the left of the decimal place and two digits to the right of the decimal place.
b) The invoice number should store integer values. The invoice date should store date values. The
invoice amount should support up to 8 digits to the left of the decimal place and two digits to the right
of the decimal place.
2. Write the SQL commands necessary to insert the data into the CUSTOMER table and the INVOICE
table created in (1).
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