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SQL Anywhere 11.0.1 » SQL Anywhere Server - SQL Usage » Querying and Modifying Data » Summarizing, grouping, and sorting query results » The GROUP BY clause: Organizing query results into groups

 

Using GROUP BY with multiple columns

You can list more than one expression in the GROUP BY clause—that is, you can group a table by any combination of expressions.

The following query lists the average price of products, grouped first by name and then by size:

SELECT Name, Size, AVG( UnitPrice )
   FROM Products
   GROUP BY Name, Size;
Name Size AVG(Products.UnitPrice)
Baseball Cap One size fits all 9.5
Sweatshirt Large 24
Tee Shirt Large 14
Tee Shirt One size fits all 14
... ... ...
Columns in GROUP BY that are not in the select list

A Sybase extension to the SQL/92 standard that is supported by both Adaptive Server Enterprise and SQL Anywhere is to allow expressions to the GROUP BY clause that are not in the select list. For example, the following query lists the number of contacts in each city:

SELECT State, COUNT( ID )
   FROM Contacts
   GROUP BY State, City;