doc/book/en/annexes/rql/language.rst
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   150 - If the sorting method (SORT_METHOD) is not specified, then the sorting is
   150 - If the sorting method (SORT_METHOD) is not specified, then the sorting is
   151   ascendant (`ASC`).
   151   ascendant (`ASC`).
   152 
   152 
   153 - Aggregate Functions: COUNT, MIN, MAX, AVG, SUM, GROUP_CONCAT
   153 - Aggregate Functions: COUNT, MIN, MAX, AVG, SUM, GROUP_CONCAT
   154 
   154 
       
   155 .. note::
       
   156    Aggregate functions will return None if there is no result row.
       
   157 
       
   158 
   155 Having
   159 Having
   156 ```````
   160 ```````
   157 
   161 
   158 The HAVING clause, as in SQL, has been originally introduced to restrict a query
   162 The HAVING clause, as in SQL, has been originally introduced to restrict a query
   159 according to value returned by an aggregate function, e.g.::
   163 according to value returned by an aggregate function, e.g.::