Which SQL statement is used to add, modify or drop columns in a database table?

[Theodore]

Hi, I have a little question that has bothered me since earlier, and I can not find an answer, which sql statement is used to add, modify or drop columns in a database table? Thank you Please give me your opinion as soon as possible.

[Elliott]

The ALTER TABLE statement is used to add, delete, or modify columns in an ... ALTER TABLE - DROP COLUMN.