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Label PostgreSQL, window function, vehicle networking, trajectory, trajectory cleaning, lag, lead background A typical scenario in Vehicle Networking is to collect the trajectories of vehicles. Generally speaking, the trajectories of vehicles are not reported in real time, and may accumulate a number of trajectory records, or how often to re ...

When migrating or upgrading SQL Server database servers, we cannot restore msdb in many scenarios, so we have to migrate SQL Server related jobs manually. If it is time-consuming and laborious to manually generate scripts for each job, there are actually several methods in SQL Server that can generate job scripts in batches. Here are some of th ...

1. Background Requirements 1. Because the data contains confidential information, you have to set up your own chart export server; generate corresponding Highcharts charts in the background, export and save them as pictures.2. Charts are more personalized, such as some columns that Highchart does not have, but can be implemented with css in the ...

logging module Basics Simple printing of logs to screen import logging logging.debug('This is debug message') logging.info('This is info message') logging.warning('This is warning message') //Screen Printing: WARNING:root:This is warning message By default, logging prints the log to the screen with a log level of WARNING: the log level s ...

1 function show( flag ){ 2 console.log( a ); 3 if( flag ){ 4 var a = 'ghostwu'; 5 return a; 6 } else { 7 console.log( a ); 8 return null; 9 } 10 } Let's start with the elevation of variables in es5. Beca ...

How to Realize To set the color of the system status bar, you need to at least set the color of the system status bar. Android More than 4.4.2 (API 19). This is because, below this version, there is no API to help us achieve. So how to set it up? Android 4.4.2 Realization android 4.4.2 adds a feature that allows the system status ...

Recently I decided to build a personal blog site and compare hexo with hugo Hugo Static Page Generation Engine with theme tranquilpeak , using the comment system Valine .The purpose of this article is to record in detail the process of creating a personal blog. Dead work Git, Golang environment GitHub Account or Gitee Account (Blog with free ...

What The so-called producer-consumer model is a model established through an intermediate buffer between a local brainless production and a local brainless consumption. This decoupling is not what many people want, and the key to decoupling is how to use the intermediate buffer. There are many examples in life, such as those selling mobile phon ...

Question: When implementing the ViewPager+Fragment interface, Huawei's mobile phones with Android 5.0 or more appear with the bottom virtual navigation bar blocking the layout. As shown in the following figure: After the problem has been solved: attempt When looking up solutions on the Internet, there are mainly two kinds: 1. Th ...

The purpose of SRWLock is the same as that of key segments, but the difference is that SRWLock can distinguish which threads want to read shared resources and which to update shared resources. Threads that read shared resources can read the same shared resources at the same time because they do not destroy the data of the shared resources, but ...