{
  "node_id": "mysql-a4773004e0cf432aa7ccdf6b9490838f",
  "keywords": ["join"],
  "children": [],
  "export": [
    "salary.json"
  ],
  "keywords_must": [
    ["mysql", "复杂连接"]
  ],
  "keywords_forbid": [],
  "group": 2
}