我是AWS DynamoDB和nosql的新手，我在创建表时遇到了问题。
我尝试创建一个名为User的表，并具有以下属性：

• UserId（HASH）
• OSType（范围）
• MSISDN
• IMSI
• DeviceID

我不仅需要通过UserId查询表，还需要通过以下字段查询：

• MSISDN
• IMSI
• DeviceID

我的逻辑如下：
1.通过UserId字段查询表。
1.如果查询没有返回任何结果，则创建一个新的查询，但检查是否有其他用户具有相同的MSISDN字段或相同的IMSI字段或相同的DeviceID字段。
在阅读了manual about LSI/GSI之后，我很难理解如何创建表和定义这些索引。
这是我特灵使用PHP+AWS SDK来创建表的代码：

$client->createTable(array(
    'TableName' => 'User',
    'AttributeDefinitions' => array(
        array('AttributeName' => 'UserId',      'AttributeType' => 'S'),
        array('AttributeName' => 'OSType',      'AttributeType' => 'S'),
        array('AttributeName' => 'MSISDN',      'AttributeType' => 'S'),
        array('AttributeName' => 'IMSI',        'AttributeType' => 'S'),
        array('AttributeName' => 'DeviceID',    'AttributeType' => 'S'),
    ),
    'KeySchema' => array(
        array('AttributeName' => 'UserId', 'KeyType' => 'HASH'),
        array('AttributeName' => 'OSType', 'KeyType' => 'RANGE')
    ),
    'GlobalSecondaryIndexes' => array(
        array(
            'IndexName' => 'IMSIIndex',
            'KeySchema' => array(
                array('AttributeName' => 'IMSI',    'KeyType' => 'HASH')
            ),
            'Projection' => array(
                'ProjectionType' => 'KEYS_ONLY',
            ),
            'ProvisionedThroughput' => array(
                'ReadCapacityUnits'  => 10,
                'WriteCapacityUnits' => 10
            )
        ),
        array(
            'IndexName' => 'MSISDNIndex',
            'KeySchema' => array(
                array('AttributeName' => 'MSISDN',  'KeyType' => 'HASH')
            ),
            'Projection' => array(
                'ProjectionType' => 'KEYS_ONLY',
            ),
            'ProvisionedThroughput' => array(
                'ReadCapacityUnits'  => 10,
                'WriteCapacityUnits' => 10
            )
        ),
        array(
            'IndexName' => 'DeviceIDIndex',
            'KeySchema' => array(
                array('AttributeName' => 'DeviceID',    'KeyType' => 'HASH')
            ),
            'Projection' => array(
                'ProjectionType' => 'KEYS_ONLY',
            ),
            'ProvisionedThroughput' => array(
                'ReadCapacityUnits'  => 10,
                'WriteCapacityUnits' => 10
            )
        ),
    ),
    'ProvisionedThroughput' => array(
        'ReadCapacityUnits'  => 50,
        'WriteCapacityUnits' => 50
    )
));

我得到这个错误：

PHP Fatal error:  Uncaught Aws\DynamoDb\Exception\ValidationException: AWS Error Code: ValidationException, Status Code: 400, AWS Request ID: 70LGIARTTQF90S8P0HVRUKSJ27VV4KQNSO5AEMVJF66Q9ASUAAJG, AWS Error Type: client, AWS Error Message: One or more parameter values were invalid: Number of attributes in KeySchema does not exactly match number of attributes defined in AttributeDefinitions, User-Agent: aws-sdk-php2/2.4.11 Guzzle/3.7.4 curl/7.29.0 PHP/5.4.14

请帮助我了解我做错了什么。我想用GSI创建表，但我就是不能理解DynamoDB中二级索引的本质：（