Sql server alter primary key add column關於「ALTER TABLE ADD primary key」標籤，搜尋引擎有相關的訊息討論：
How to add a primary key and foreign key to an existing table in ...stackoverflow.com › questions › how-to-add-a-primary-ke...SQL PRIMARY KEY Constraint - W3Schoolswww.w3schools.com › sql › sql_primarykeyALTER PRIMARY KEY | CockroachDB Docswww.cockroachlabs.com › docs › stable