Answers for "alter table modify sql server"

alter table query sql server change column

ALTER TABLE table_name
  ALTER COLUMN column_name column_type;

alter table query sql server change column

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

alter table query sql server change column

sp_rename 'employees.last_name', 'lname', 'COLUMN';