（单选题）
You just issued the following statement: ALTER TABLE SALES DROP COLUMN PROFIT. Which of the following choices identifies when the column will actually be removed from Oracle?（）
AImmediately following statement execution
BAfter the ALTER TABLE DROP UNUSED COLUMNS command is issued
CAfter the ALTER TABLE SET UNUSED COLUMN command is issued
DAfter the ALTER TABLE MODIFY command is issued
正确答案
答案解析
略
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