Oracle DROP constraint關於「Alter unique index Oracle」標籤，搜尋引擎有相關的訊息討論：
EGL: CANNOT CREATE UNIQUE INDEXES IN APPLICATION ...support.oracle.com › knowledgeunique index - Ask TOMasktom.oracle.com › pls › apexCreating Indexesdocs.oracle.com › server.112 › indexes003Why unique index AND unique constraint (multi columns)?stackoverflow.com › questions ›