データベース上の不要なメール保存用のフォルダを削除するには，次に示すSQLを実行します。SQL中の「ユーザID」には，削除したいユーザのユーザIDを記述します。ユーザIDを記述するときは，誤りのないように注意してください。

実行するSQL

   delete from tbl_apdfile where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_aldyread where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_contents where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_opinion where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_state where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_attribute where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_importance where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_uaccess where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_sequence2 where
    category=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_sequence1 where
    category=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_mainforum where
    fid=(select fid from tbl_forum where userid='ユーザID');
   delete from tbl_forum where userid='ユーザID';