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4. Write a query to count the number of invoices.

4. Write a query to count the number of invoices.

Database System Concepts
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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4. Write a query to count the number of invoices.
Transcribed Image Text:4. Write a query to count the number of invoices.
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).
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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