php中mongodb如何分组查询请平均数和总和？
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使用aggregate，结合group及max min sum，具体代码如下：
<?php
$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");
// 插入数据
$bulk = new MongoDB\Driver\BulkWrite;
$bulk->insert(['x' => 2, 'name' =>'bfw','scores'=>123]);
$bulk->insert(['x' => 2, 'name' =>'google','scores'=>10]);
$bulk->insert(['x' => 2, 'name' =>'baidu','scores'=>11]);
$bulk->insert(['x' => 2, 'name' =>'bfw','scores'=>200]);
$_data=$manager->executeBulkWrite('test.sites2', $bulk);
...点击查看剩余70%
by thinkfuture
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