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Mar 18, 2021
Replied to a topic by MIUIOS MySQL Mysql 不进行 join 操作如何做多表筛选呢
select count(*) from A where date>today()-30 and ID in (
select ID from B where level='VIP'
) limit start,limit

用 in 条件查询呢
Jan 11, 2018
Replied to a topic by yantianqi 程序员 node.js 做中间层是怎么个开发流程?
nodejs + mq
Dec 7, 2017
Replied to a topic by kkfnui 问与答 InfluxDB 插入数据 “数据丢失”
@rrfeng 要这么说的话,实际上应该是 series
Dec 7, 2017
Replied to a topic by kkfnui 问与答 InfluxDB 插入数据 “数据丢失”
influxdb 插入数据格式为 insert measurement,tag=value field=value timestamp
是按照时间存储的

对于 measurement tagkey, tagvalue 和 timestamp 一样的,field 会被最新的值替换
Dec 7, 2017
Replied to a topic by kkfnui 问与答 InfluxDB 插入数据 “数据丢失”
看下丢失的都是些什么数据,和没有丢失的数据的区别是什么
时序数据库
这个 蛮有意思的
Nov 22, 2017
Replied to a topic by inkWave Node.js 如何用 node.js 统计用户访问时间
用户访问时长问题(会话时长)吧? 实际上不管服务端统计还是客户端统计都是存在误差的,因为你无法知道用户是否还在访问你的页面,按照上面的说明, 比如我打开一个 A 页面,然后新打开 tab 访问百度,过了一个小时再回来,难道用户就真的是访问 A 页面(或者留存在 A 页面)一个小时么?
Sep 20, 2017
Replied to a topic by poorcai iOS 已经升级 iOS 11 正式版的可以进来聊聊吗?
@justfly 确定么?不太敢升啊
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