ALTER TABLE settings ADD COLUMN multi_user TINYINT(1)NOT NULL DEFAULT 1 而且我只想在此列不存在的情况下更改此表。我正在尝试许多不同的方法,但是没有任何效果: ALTER TABLE settings ADD COLUMN IF NOT ...
MySQL Server 8.0.17 deprecated the display width for the TINYINT,SMALLINT,MEDIUMINT,INT,and BIGINT data types when the ZEROFILL modifier is not used,and MySQL Server 8.0.19 has removed the display ...