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Transact-SQL User's Guide
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The compute clause
The Transact-SQL compute clause
extension is used with the row aggregate functions sum, max, min,
avg, and count to calculate summary values.
Queries that include a compute clause display results with both detail
and summary rows. These reports resemble those produced by almost
any Database Management System (DBMS) with a report generator. compute displays
summary values as additional rows in the results, instead of as
new columns. The compute clause is covered in Chapter 3, "Using Aggregates, Grouping,
and Sorting."