Druid 支持两种查询语言： Druid SQL 与 原生查询（native query）。本教程聚焦 Druid SQL，它基于 Apache Calcite 将 SQL 解析并翻译为原生 JSON 查询后在数据节点上执行。查询可以通过三种方式发起：Web 控制台、命令行工具、HTTP POST 请求，下面逐一展开。

Interactive SQL learning platform. Write real queries against real databases in the browser. 55 lessons across 11 modules, with an AI tutor that helps when you get stuck.

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