Computing Statistical Values
Counting and summing are not the only aggregate options that you have available. You can also use both basic and advanced statistical functions in your queries. As before, these functions allow you to work directly with the database to obtain results, yielding excellent processing efficiency.
You can use these functions in the same way that you used the SUM function. Filters and grouping can be added to suit your needs. When you filter or group these functions, the resulting value of each function will vary according to its definition. (The scripts in this section are included in the samples as StatisticalExamplesFromText.sql in the \SqlScripts folder.)
Using AVG
The AVG function returns the average of the values ...
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