Let’s say we want to add a new text column
nickName to the
students table below.
SQL provides an
ALTER TABLE statement, for making such updates to the structure of a table.
To add a column to a table, the
ALTER TABLE statement can be used with an
ADD COLUMN statement.
To add a column with constraints, we need to add the constraints along with the column description, similar to how a column constraint is specified in
CREATE TABLE statements.