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CollectionFind::groupBy — Set grouping criteria
This function can be used to group the result set by one or more columns.
It is often used with aggregate functions such as COUNT,
MAX, MIN, SUM etc.
sort_exprThe column 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 object 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();
?>