Oracle DROP INDEX關於「Oracle remove primary key」標籤，搜尋引擎有相關的訊息討論：
How to Remove a Primary Key in SQL | LearnSQL.comlearnsql.com › cookbook › how-to-remove-a-primary-key...Oracle / PLSQL: Primary Keys - TechOnTheNetwww.techonthenet.com › oracle › primary_keysDROP PRIMARY KEY doesn't drop the UNIQUE INDEXcommunity.oracle.com › threadDrop Primar