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SQL in a Nutshell
book

SQL in a Nutshell

by Kevin Kline
December 2000
Intermediate to advanced content levelIntermediate to advanced
224 pages
9h 52m
English
O'Reilly Media, Inc.
Content preview from SQL in a Nutshell

Name

AVG and SUM

Synopsis

The AVG function computes the average of values in a column or an expression. SUM computes the sum. Both functions work with numeric values and ignore NULL values. They also can be used to compute the average or sum of all distinct values of a column or expression.

AVG and SUM are supported by Microsoft SQL Server, MySQL, Oracle, and PostgreSQL.

Example

The following query computes average year-to-date sales for each type of book:

SELECT   type, AVG( ytd_sales ) AS "average_ytd_sales"
FROM     titles 
GROUP BY type;

This query returns the sum of year-to-date sales for each type of book:

SELECT   type, SUM( ytd_sales ) 
FROM     titles 
GROUP BY type;
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Publisher Resources

ISBN: 1565927443