如何在Dynamo db中编写此复杂的mysql查询

Question

How can I modify this query to dynamo db query, i am not able to find the examples on aggregate functions and also date operations in dynamo db..

SELECT DATE(`date`) AS day ,SUM(`power`) AS power 
  FROM `ogm` 
  WHERE `id`!=0 
   AND DATE(`date`)>=DATE(NOW()) - INTERVAL 31 DAY GROUP BY day; 

Answer 1

Use DynamoDB client and scan operation to run complex query.

Something like this not tested :

$client->scan([
    'TableName' => 'omg',
    'ScanFilter' => [
        'id' => [
            'AttributeValueList' => [
                'S' => '0',
            ],
            'ComparisonOperator' => 'NE',
        ],
        'date' => [
            'AttributeValueList' => [
                'S' => date('Y-m-d', strtotime('-31 days')),
            ],
            'ComparisonOperator' => 'GE',
        ],
    ],
    'ConditionalOperator' => 'AND'
]);

ComparisonOperator values list.

Keep in mind that this query will return only up to 1mb of data, you have to re-loop it. And don't even think about pagination :D