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wrote...
Posts: 274
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2 months ago
The following database will be used in this question:

GENERAL SALES DATABASE:

SALESREP
SalesRepNoRepNameHireDate
654Jones01/02/2005
734Smith02/03/2007
345Chen01/25/2018
434Johnson11/23/2004

CUSTOMER
CustNoCustNameBalanceSalesRepNo
9870Winston500345
8590Gonzales350434
7840Harris800654
4870Miles100345

Explain the use of the GROUP BY keyword. Include an example based on the CUSTOMER table from the General Sales database.
Source  Download
Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
Authors:
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wrote...
2 months ago
The GROUP BY keyword is used in conjunction with the built-in functions of SQL. The GROUP BY keyword is given a column that records are to be grouped on. Records in the result table are then collected into groups based on the value of the grouping column. The built-in function is then performed on the records of each group separately. For example,

SELECT AVG(Balance)
FROM CUSTOMER
GROUP BY SalesRepNo;

is a query that returns the average balance of all customers associated with a specific sales representative.
wrote...
2 months ago
Smart ... Thanks!
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