Which of the following options is not correct?
Answer options
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;
Detailed Solution & Conceptual Analysis
This question has been retained as-is due to its unique context.
Key Engineering Takeaway
In Database Management, understanding the underlying mechanics of Database Management is critical for writing performant, bug-free production code and passing rigorous technical architecture reviews.