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docs/functions/aggregatefunctions.rst
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SQL group (aggregate) functions operate on sets of values. If you use an aggregate function in a statement containing no GROUP BY clause, it is equivalent to grouping on all rows.
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General syntax for aggregate functions is:
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.. code-block:: mysql
 
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General syntax for aggregate functions is: ::
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        SELECT "function type" ("column_name")
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        FROM "table_name";
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The following are examples of aggregate functions:
 
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The following are examples of aggregate functions:
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**AVG**:  Return the average value of the argument. (Does not work with temporal values unless first converted to numeric values.)
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