TDengine 窗口函数(OVER 子句)完全指南:语法、窗口帧、命名窗口与实战示例
2026/9/21 0:37:40
在开始使用Elasticsearch时,我们需要对数据进行映射设置。以下是一个示例的映射结构:
{ // 这里可能是某个索引类型的整体设置 "name" : { "type" : "object", "properties" : { "firstName" : {"type" : "string", "store": "yes"}, "lastName" : {"type" : "string", "store": "yes"} } }, "isbn" : {"type" : "string", "store": "yes"}, "englishTitle" : {"type" : "string", "store": "yes"}, "year" : {"type" : "integer", "store": "yes"}, "characters" : { "properties" : { "name" : {"type" : "string", "store": "yes"} } }, "copies" : {"type" : "integer", "store": "yes"} }这里将所有字段的store属性都设置为yes,目的是展