ALTER TABLE project_list
CHANGE COLUMN proj_id proj_id1 INT NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY ('proj_id1');
ALTER TABLE project_list
modify COLUMN proj_id INT NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY ('proj_id');
синтаксисALTER TABLE project_list
CHANGE COLUMN proj_id proj_id1 INT NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY (proj_id1);