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Description:
Know the view you want to drop, but don't know how to check for existence? Want to drop all views in the system, but have no automated way of doing it? Specify the view name as the parameter to drop only that view (IF it exists). Leave it empty to drop'em all.

Usage:
To drop a single view by name:

call sp_Drop_View('vw_People_Info');

To drop all views in a database:

call sp_Drop_View();

Code:

create procedure sp_Drop_View (IN @viewName varchar(128) DEFAULT 'NONE')
begin           
    IF @viewName = 'NONE' THEN
        FOR VIEW_NAME_FOR as VIEW_NAME_CURSOR dynamic scroll cursor for
                select st.table_name as VIEW_NAME
                  from systab st
                 where st.creator = 1 AND
                       st.table_type = 'VIEW'
              order by st.table_name asc do
            execute immediate 'DROP VIEW ' || VIEW_NAME;
        END FOR;
    ELSE
        if exists(select 1 from sys.systable where table_name=@viewName and table_type='VIEW') then
            EXECUTE IMMEDIATE 'DROP VIEW ' || @viewName;
        end if;
    END IF;
end;