# 为警报日志创建和查询表
<a name="querying-network-firewall-logs-sample-alert-logs-table"></a>

1. 修改下面的 DDL 语句示例，使其符合警报日志的结构。您可能需要更新语句以包含最新版本日志的列。有关更多信息，请参阅《*Amazon Network Firewall 开发人员指南*》中的[防火墙日志的内容](https://docs.amazonaws.cn/network-firewall/latest/developerguide/firewall-logging.html#firewall-logging-contents)。

   ```
   CREATE EXTERNAL TABLE network_firewall_alert_logs (
     firewall_name string,
     availability_zone string,
     event_timestamp string,
     event struct<
       timestamp:string,
       flow_id:bigint,
       event_type:string,
       src_ip:string,
       src_port:int,
       dest_ip:string,
       dest_port:int,
       proto:string,
       app_proto:string,
       sni:string,
       tls_inspected:boolean,
       tls_error:struct<
         error_message:string>,
       revocation_check:struct<
         leaf_cert_fpr:string,
         status:string,
         action:string>,
       alert:struct<
         alert_id:string,
         alert_type:string,
         action:string,
         signature_id:int,
         rev:int,
         signature:string,
         category:string,
         severity:int,
         rule_name:string,
         alert_name:string,
         alert_severity:string,
         alert_description:string,
         file_name:string,
         file_hash:string,
         packet_capture:string,
         reference_links:array<string>
       >, 
       src_country:string, 
       dest_country:string, 
       src_hostname:string, 
       dest_hostname:string, 
       user_agent:string, 
       url:string
      >
   )
    ROW FORMAT SERDE 'org.openx.data.jsonserde.JsonSerDe'
    LOCATION 's3://amzn-s3-demo-bucket/path_to_alert_logs_folder/';
   ```

1. 修改 `LOCATION` 子句以指定您在 Amazon S3 中的日志文件夹。

1. 在 Athena 查询编辑器中运行 `CREATE TABLE` 查询。查询完成后，Athena 将注册 `network_firewall_alert_logs` 表，使其指向的数据可以进行查询。

## 示例查询
<a name="querying-network-firewall-logs-alert-log-sample-query"></a>

本节中的示例警报日志查询会筛选执行了 TLS 检查且警报严重性级别为 2 或更高的事件。

查询使用别名来创建输出列标题，以显示列所属的 `struct`。例如，`event.alert.category` 字段的列标题是 `event_alert_category`，而不只是 `category`。若要进一步自定义列名，可以根据自己的喜好修改别名。例如，可以使用下划线或其他分隔符来分隔 `struct` 名称和字段名称。

请记得根据表定义和查询结果中所需的字段修改列名和 `struct` 引用。

```
SELECT 
  firewall_name,
  availability_zone,
  event_timestamp,
  event.timestamp AS event_timestamp,
  event.flow_id AS event_flow_id,
  event.event_type AS event_type,
  event.src_ip AS event_src_ip,
  event.src_port AS event_src_port,
  event.dest_ip AS event_dest_ip,
  event.dest_port AS event_dest_port,
  event.proto AS event_protol,
  event.app_proto AS event_app_proto,
  event.sni AS event_sni,
  event.tls_inspected AS event_tls_inspected,
  event.tls_error.error_message AS event_tls_error_message,
  event.revocation_check.leaf_cert_fpr AS event_revocation_leaf_cert,
  event.revocation_check.status AS event_revocation_check_status,
  event.revocation_check.action AS event_revocation_check_action,
  event.alert.alert_id AS event_alert_alert_id,
  event.alert.alert_type AS event_alert_alert_type,
  event.alert.action AS event_alert_action,
  event.alert.signature_id AS event_alert_signature_id,
  event.alert.rev AS event_alert_rev,
  event.alert.signature AS event_alert_signature,
  event.alert.category AS event_alert_category,
  event.alert.severity AS event_alert_severity,
  event.alert.rule_name AS event_alert_rule_name,
  event.alert.alert_name AS event_alert_alert_name,
  event.alert.alert_severity AS event_alert_alert_severity,
  event.alert.alert_description AS event_alert_alert_description,
  event.alert.file_name AS event_alert_file_name,
  event.alert.file_hash AS event_alert_file_hash,
  event.alert.packet_capture AS event_alert_packet_capture,
  event.alert.reference_links AS event_alert_reference_links,
  event.src_country AS event_src_country,
  event.dest_country AS event_dest_country,
  event.src_hostname AS event_src_hostname,
  event.dest_hostname AS event_dest_hostname,
  event.user_agent AS event_user_agent,
  event.url AS event_url
FROM 
  network_firewall_alert_logs 
WHERE 
  event.alert.severity >= 2
  AND event.tls_inspected = true 
LIMIT 10;
```