You can’t specify target in MySQL The error of table for update in FROM clause means that you cannot select some values in the same table first, and then update this table (in the same statement)
Month: October 2021
C # WinForm Control Adaptive Form Size
Requirement: When the size of the form changes dynamically, various controls in the form (including Panel and sub-controls in the Panel) can dynamically adjust their size to adapt to the proportion
MySQL backup file. XB database backup restore
Today an old friend told me that his mysql backup file suffix .xb could not be restored, or it was restored with only tables without data, so I decided to try I did a backup and restore, and I sear
C # subclinger callback function notifies the main thread completion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
namespace ConsoleApplication5
{
public class ThreadCallBackTest
{
///
/// Record
MySQL supported data type
Data types supported by mysql Integer ”’ Type tinyint: 1 byte, value range -128~127, default length 4 smallint: 2 bytes, value range -32768 ~ 32767, default length 6 mediumint: 3 bytes int: 4 byte
Leetcode9_ back to the number
Hahahahahahaha, I’m so happy, today’s code time and memory consumption are half of the official code haha
(Because the official code is written in C#, I use C++, manual dog head)
Title<
MySQL data type
Data types are the basic rules that define what data can be stored in a column and how the data is stored
When designing a table, you should pay special attention to the data type used. Using the
MySQL master from mount
1. Modify the my.cnf file
vim /etc/my.cnf 1.1 Main Library< /p> #The current mysql service number is 1, which is the first mysql server
server-id=1
#Binary log file
log-bin=mysql-bin
1
How to manage Java certificates in a distributed Jenkins build environment?
I have a Jenkins server, which rotates nodes as the build traffic increases. I am trying to run integration tests with a project, and it requires me to have a certificate generated by keytool to co
Playing thread architecture
Play is described as a “reactive” framework, which is very useful for asynchronous programming. I want to know more about the architecture of Play, mainly:
> Does it have an event loop?
>Doe