Database Management

Accenture PrimermediumDatabase Management03 Data Definition Language

Which of the following options is not correct?

A

alter table emp drop column_name;

B

alter table emp drop column salary;

C

alter table emp add column salary number;

D

alter table emp modify salary varchar(20);

Correct answer: alter table emp drop column_name;

Explanation

The correct syntax is ALTER TABLE emp DROP COLUMN salary; — missing the COLUMN keyword.

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