考试
2021-02-19 07:51:12

(多选题)Examine the following com

题目描述

AThe %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.

BThe DESCRIBE commands in SQL *Plus will not display the invisible column in the output.

CReferential integrity constraint cannot be set on the invisible column.

DThe invisible column cannot be made visible and can only be marked as unused.

EA primary key constraint can be added on the invisible column.

答案解析

[db:答案解析]

A,B,C

加载中...
AI正在思考中,请稍候...