在 MySQL 的面试中有一类经典的面试题。比如：如何给正在线上运行的表执行 DDL 语句？ 回答这个问题，首先我们需要明确，执行 DDL 语句的时候，MySQL 会干什么？ 在 MySQL 5.6 之前，执行 DDL 语句的时候，会给表添加写锁，会阻塞该表其他所有的读写操作。这对 ...

Usage: sqlite3mysql [OPTIONS] Options: -f, --sqlite-file PATH SQLite3 database file [required] -t, --sqlite-tables TUPLE Transfer only these specific tables (space separated table names). Implies ...

Usage: mysql2sqlite [OPTIONS] Options: -f, --sqlite-file PATH SQLite3 database file [required] -d, --mysql-database TEXT MySQL database name [required] -u, --mysql ...

Abstract: Partial video copy detection (PVCD) aims to discover copy segments of query videos from a video database, which plays an important role in video copyright protection, filtering, tracking, ...

其中数据类型必须显式声明，即使不修改数据类型也需重复原类型。例如将students表的name字段改为full_name： 修改字段名会影响依赖该字段的视图、存储过程和应用程序代码，需同步更新 建议在操作前备份数据，避免意外数据丢失 若需同时修改字段属性（如默认 ...

A top Social Security Administration official turned whistleblower says members of the Trump administration’s Department of Government Efficiency (DOGE) uploaded hundreds of millions of Social ...

Excel is available online through Excel Web App or Excel Online or Office 365. Sometimes, when you try to copy data from the online version to anything else on the ...

Community driven content discussing all aspects of software development from DevOps to design patterns. If you plan to do database development with Java and MySQL, the first thing you’ll need to do is ...

If you have an Apple Account (formerly Apple ID), Apple allows you to request a downloadable copy of the data associated with it. This article outlines the steps you need to take to request a copy of ...