Oracle PL/SQL/System Tables Views/user unused col tabs

Query user_unused_col_tabs

   <source lang="sql">

create table people(

 employee_id     number(9),
 first_name      varchar2(15),
 last_name       varchar2(20),
 email           varchar2(25),
 constraint pk_people primary key (employee_id)

); insert into people values (1, "T", "Kyte", "Y@q.ru"); insert into people values (2, "S", "Viper","s@q.ru"); insert into people values (3, "C", "Beck", "c@q.ru");

alter table people drop column first_name; alter table people drop column last_name; select * from user_unused_col_tabs; ALTER TABLE people DROP UNUSED COLUMNS; drop table people;

</source>