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CollectionFind::groupBy — Set grouping criteria
This function can be used to group the result-set by one more columns, frequently this is used with aggregate functions like COUNT,MAX,MIN,SUM etc.
sort_exprThe columns or columns that have to be used for the group operation, this can either be a single string or an array of string arguments, one for each column.
A CollectionFind that can be used for further processing
示例 #1 mysql_xdevapi\CollectionFind::groupBy() example
<?php
//Assuming $coll is a valid Collection object
//Extract all the documents from the Collection and group the results by the 'name' field
$res = $coll->find()->groupBy('name')->execute();
?>