how to alter a table column type code example

Example 1: sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

Example 2: sql alter table

Adds, deletes or edits columns in a table. It can also be used to add and
delete constraints in a table, as per the above.
Example: Adds a new boolean column called ‘approved’ to a table named
‘deals’.
ALTER TABLE deals
ADD approved boolean;
Example 2: Deletes the ‘approved’ column from the ‘deals’ table
ALTER TABLE deals
DROP COLUMN approved;