mysql | 易学教程

bat脚本常用命令

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意气风发啊骑上我快乐的小摩托良心公众号啊！我上墙了你开始了嚯嚯嚯嚯嚯哈哈哈哈哈皮皮虾我们走可乐在厨房红牛在冰箱 6666666 看弹幕，点关注 " 我相信这不是我一个人的经历：傍晚时分，你坐在屋檐下，看着天慢慢地黑下去，心里寂寞而凄凉，感到自己的生命被剥夺了。当时我是个年轻人，但我害怕这样生活下去，衰老下去。在我看来，这是比死亡更可怕的事。 ——《沉默的大多数》 " title: bat脚本常用命令 date: 2019-11-14 20:23:36 tags: windows script categories: windows script Author：闫玉良 bat 脚本？如果不是从事微软开发相关工作的人员，是不是感觉很耳熟但是又好像不熟悉？还等什么，一睹为快 bat 脚本是 windows 上所用的脚本，我们经常使用的 cmd 一些命令就可以使用。也许你会说为什么不使用 powershell 脚本？因为古老的一些服务器上面没有安装 powershell 你信不信？比如 windows server 2003。很荣幸，我遇到了，没有什么办法，只能查阅相关资料迎难而上了！脚本其实很简单，下面做一个记录，供大家有需要时获取： 1.设置变量设置变量使用 SET 关键字，语法如下： SET 变量名=变量值 1. 变量名与变量值一定要紧挨等于号！！！

因未发奖金，一名程序员删代码泄愤，平台崩溃近三个小时

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点击上方“ 程序猿技术大咖 ”，关注加群讨论来自：程序员新鲜事（ID：CoderNews）内容综合自：InfoQ、雷锋网、AI前线近日，又发生了一起删代码事件。一名程序员因不满公司未发奖金，怒而修改华为云obs对象存储服务代码，导致平台大范围崩溃。最终，这位“一时冲动”的程序员因涉嫌犯破坏计算机信息系统罪，获得了 5个月的刑期。事情的经过是这样的：被告人王某（以下简称：王某）所在的公司项目是一个同城生活服务平台，主要是满足晋城消费者线上、线下的吃、喝、玩、乐、购服务。 2019年12月，时任公司技术部的刘经理交给王某一个任务：开发 obs 代码，如果开发成功公司会有奖励。在开发过程中王某负责写代码，另一位同事则负责做前段代码工作。开发完毕经过测试没有问题，就开始在公司运行。程序是运行起来了，但公司承诺的奖金却迟迟没有下来，这让王某产生了报复的心理。 2020年4月13日11点左右，王某就开始实施“报复”。通过winscp软件使用root账户（超级管理员账户）登录至华为云服务器的FTP，将本地的php代码替换了华为云服务器php代码，导致了用户从web服务器直接下载未缓存的图片，高峰期会导致下载缓慢或卡死。果不其然，4月14日8点至9点30分左右，当该平台向用户代发76万元的电子消费劵的时候，有用户打电话反应称平台打不开

Select data between 2 dates and average hourly output

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问题 I am have a series of temperature data which is gathered every minute and put into a MySQL database. I want to write a query to select all temperatures for the last 24 hours then group and average them into hours. Is this possible via a SQL command? I think its a case of selecting all records between the two date/times, but thats the point I get stuck. Data Example: ID Temp Timestamp 3922 22 2015-11-17 14:12:23 3923 22 2015-11-17 14:13:23 3924 22.05 2015-11-17 14:14:23 3925 22.05 2015-11-17

Datetime behind an hour after insertion. Daylight savings

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问题 I've noticed that my MySql database is subtracting an hour from my DateTime objects when I insert certain dates to my tables. Example: Insert: 2021-03-29 11:44:14.938 Result: 2021-03-29 10:44:14.938 I am inserting Java.Sql.Timestamp object ( timestamp below) using JdbcTemplate.update: jdbcTemplate.update(new PreparedStatementCreator() { @Override public PreparedStatement createPreparedStatement(Connection con) throws SQLException { PreparedStatement stmt = con.prepareStatement( "INSERT INTO

Datetime behind an hour after insertion. Daylight savings

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MySQL Select Latest Row of Specific Value

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问题 I'm battling to wrap my head around producing a single MySQL query that would heed the correct results. I've got a table that is structured as followed: workflow_status_history: id reference status 1 308ffn3oneb Lead Received 2 308ffn3oneb Quoted 3 308ffn3oneb Invoiced 4 853442ec2fc Lead Received As you can see, the workflow_status_history table keeps a history of all the statuses of each workflow on our system, rather than replacing or overwriting the previous status with the new status.

ERROR 1356 (HY000): View 'mysql.user' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them

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问题 I have tried query but error anybody solved the error? MariaDB [mysql]> UPDATE user SET Host='%' WHERE User='root'; ERROR 1356 (HY000): View 'mysql.user' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them 回答1: MariaDB-10.4+ the mysql . user is a view rather than a table. Its recommend to stop copying off old blogs to do any authentication relates changes in MySQL and MariaDB, the mechanisms are being updated and no longer apply. Always

ERROR 1356 (HY000): View 'mysql.user' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them

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Transferring “Money” between accountID in MySQL

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问题 I have a question which I have tried to Google but haven't find an answer to yet. What I am trying to do is transferring money between two accounts in MySQL with a stored procedure. If I for example use Call transfer (20,'Test',3,5). Then I will transfer 20 dollars from accountID 3 to accountID 5 and write the message "Test" , which is what it should do. At the moment it is however possible to send money between non-existing accounts and the amount can be <0 for the sending accountID, for

Is it possible to create a column in MySQL with an expression as a default value?

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问题 How would one implement this in MySQL: CREATE TABLE employee ( employeemonthly DECIMAL(10,2), employeeyearly DECIMAL(10,2) DEFAULT employeemonthly*12 ); 回答1: use a insert trigger for that. Something like this DELIMITER | CREATE TRIGGER default_yearly BEFORE INSERT ON employee FOR EACH ROW BEGIN SET NEW.employeeyearly = NEW.employeemonthly * 12; END; | DELIMITER ; 回答2: I would use a view: CREATE VIEW vemployees AS SELECT e.employeemonthly, e.employeemonthly * 12 AS employeeyearly FROM EMPLOYEE

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