[
    {"category_id": 1,"category_name": "数据查询","category_introduction": "最常用，最基础，必须会"},
    {"category_id": 2,"category_name": "多表连接","category_introduction": "定会用到，必要掌握"},
    {"category_id": 3,"category_name": "条件判断","category_introduction": "频率高，内容多，影响大"},
    {"category_id": 4,"category_name": "窗口函数","category_introduction": "极其有用，省时省力"},
    {"category_id": 5,"category_name": "字符串操作","category_introduction": "库不同则不同，头疼"},
    {"category_id": 6,"category_name": "数据插入","category_introduction": "第一步，无插入，不数据"},
    {"category_id": 7,"category_name": "数据更新","category_introduction": "唯一不变的，是变化本身"},
    {"category_id": 8,"category_name": "数据删除","category_introduction": "不需要了，就尽早摆脱"},
    {"category_id": 9,"category_name": "表创建","category_introduction": "表格，碰触最多，操作较少"},
    {"category_id": 10,"category_name": "表修改","category_introduction": "在最开始就做好调整的准备"},
    {"category_id": 11,"category_name": "表删除","category_introduction": "删了再建新的吧，享受清理"},
    {"category_id": 12,"category_name": "数据库创建","category_introduction": "故事的开始，一切的开始"},
    {"category_id": 13,"category_name": "数据库删除","category_introduction": "抛下一切，重新开始"},
    {"category_id": 14,"category_name": "数据库修改","category_introduction": "计划赶不上变化，随机应变"}
]