CREATE TABLE IF NOT EXISTS [users] (
  [id] INTEGER PRIMARY KEY, 
  [name] TEXT, 
  [tel] CHAR(15));


CREATE TRIGGER IF NOT EXISTS oldtel BEFORE UPDATE OF tel ON users 
begin
INSERT INTO users_log SELECT * FROM users WHERE id=old.id;  
end;


CREATE TABLE IF NOT EXISTS [users_log] (
  [id] INTEGER, 
  [name] TEXT, 
  [tel] CHAR(15));