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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?（）

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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?（）

A. Immediately following statement execution

B. fter the ALTER TABLE DROP UNUSED COLUMNS command is issued

C. fter the ALTER TABLE SET UNUSED COLUMN command is issued

D. fter the ALTER TABLE MODIFY command is issued

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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?（）

A. Immediately following statement execution B. fter the ALTER TABLE DROP UNUSED COLUMNS command is issued C. fter the ALTER TABLE SET UNUSED COLUMN command is issued D. fter the ALTER TABLE MODIFY command is issued

相关试题

A. Immediately following statement execution

B. fter the ALTER TABLE DROP UNUSED COLUMNS command is issued

C. fter the ALTER TABLE SET UNUSED COLUMN command is issued

D. fter the ALTER TABLE MODIFY command is issued