modify a column in alter table command code example

Example 1: alter table modify column

-- ORACLE 18c
ALTER TABLE table_name 
MODIFY column_name datatype;

-- Example
ALTER TABLE product
MODIFY description VARCHAR2(500 char);

Example 2: alter table query sql server change column

sp_rename 'table_name.old_column_name', 'new_column_name', 'COLUMN';