离散查询select * from car where price=30 or price=40 or price=50 or price=60;select * from car where price in(30,40,50,60)取出数据select * from car where price not in(30,40,50,60)去掉数据 聚合函数(统计查询)select count(*) from carselect count(code) from car #取所有的数据条数sel
https://www.cnblogs.com/jing1617/p/8060421.html ElasticSearch之CURL操作 CURL的操作 curl是利用URL语法在命令行方式下工作的开源文件传输工具,使用curl可以简单实现常见的get/post请求.简单的认为是可以在命令行下面访问url的一个工具.在centos的默认库里面是有curl工具的,如果没有请yum安装即可. curl -X 指定http的请求方法 有HEAD GET POST PUT DELE
分给线一下内容为理解错误内容,实际允许建立父子分档,只是类型改成来 join 官方demo: join datatypeedit The join datatype is a special field that creates parent/child relation within documents of the same index. The relations section defines a set of possible relations within the document