ALTER TABLE celebs ADD COLUMN twitter_handle TEXT;
ALTER TABLE statement added a new column to the table. You can use this command when you want to add columns to a table.
ALTER TABLE is a clause that lets you make the specified changes.
celebs is the name of the table that is being changed.
ADD COLUMN is a clause that lets you add a new column to a table.
twitter_handle is the name of the new column being added
TEXT is the data type for the new column
NULL is a special value in SQL that represents missing or unknown data. Here, the rows that existed before the column was added have
NULL values for