MySQL ALTER COLUMN type關於「MySQL ADD column after」標籤，搜尋引擎有相關的訊息討論：
MySQL 8.0 Reference Manual :: 13.1.9 ALTER TABLE Statementdev.mysql.com › doc › refman › alter-tableMySQL 8.0: InnoDB now supports Instant ADD COLUMNdev.mysql.com › blog-archive › mysql-8-0-innodb-now-s...How to Add Columns To A Table Using MySQL ADD COLUMNwww.mysqltutorial.org