The Transact-SQL compute clause extension is used with the row aggregate functions sum, max, min, avg, count, and count_big 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.”
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