Transcription of Aggregate Calculations and Subqueries - …
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Aggregate Calculations and Subqueries - …
Chapter OverviewChapter OverviewChapter OverviewChapter OverviewChapter OverviewSo far we have examined all the basic ways to query information from a single table, butthere are many more powerful query tools in SQL. In this chapter we will examine twomore. One uses Aggregate functions to assemble rows of data into totals, counts, andother Calculations . The other sets a query inside a query. This is called a subquery, and itprovides tremendous extensions to the power of ObjectivesChapter ObjectivesChapter ObjectivesChapter ObjectivesChapter ObjectivesIn this chapter, we will: Learn what Aggregate functions are Write SQL queries to summarize data into Aggregate Calculations Learn what a subquery is and where it can be used in SQL Learn how to use Subqueries in the WHERE clause Use the ANY and ALL keywords with subqueriesAggregate FAggregate FAggregate FAggregate FAggregate Functionsunctionsunctionsunctionsunction sWe have already seen how to create calculated columns in a query.
50 Chapter Three—Aggregate Calculations and Subqueries row at a time. An aggregate calculation summarizes values from entire groups of rows. The word
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