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SAP Sybase SQL Anywhere 16.0 » SQL Anywhere Server - SQL Usage » Queries and data modification » Summarizing, grouping, and sorting query results


The GROUP BY clause: Organizing query results into groups

The GROUP BY clause divides the output of a table into groups. You can group rows by one or more column names, or by the results of computed columns.

Order of clauses

If a WHERE clause and a GROUP BY clause are present, the WHERE clause must appear before the GROUP BY clause. A GROUP BY clause, if present, must always appear before a HAVING clause. If a HAVING clause is specified but a GROUP BY clause is not, a GROUP BY () clause is assumed.

HAVING clauses and WHERE clauses can both be used in a single query. Conditions in the HAVING clause logically restrict the rows of the result only after the groups have been constructed. Criteria in the WHERE clause are logically evaluated before the groups are constructed, and so save time.

 See also

How queries with GROUP BY are executed
GROUP BY with multiple columns
WHERE clause and GROUP BY
GROUP BY with aggregate functions
GROUP BY and the SQL/2008 standard