Try this : ALTER TABLE table ADD COLUMN col1 int, ADD COLUMN col2 int;. ... <看更多>

ALTER TABLE ADD COLUMN will only add the new column at the end, as the last one. In order to create a new column in another position you need to recreate ... ... <看更多>

In PostgreSQL, and MySQL (MyISAM and InnoDB) I create millions of rows and then ... ALTER TABLE words ADD COLUMN pos2 varchar(30) NOT NULL DEFAULT 'noun';. ... <看更多>