Isql*plus 9.2 problem: Substitution variables

Question

hi, i'm new to using isql*plus.
i have written the following script to setup my the structure of a database, it works but when i execute it it asks me to:
Substitution Variables
Enter values for substitution variables in the script to execute:
Variable      Value
d
I cant work out why, please help.
here's the script:
--author: daniel smith
--student number: 2235592
--date: 17/02/2005
--isql plus
--Application Development and Database (AD&D)
--Assessment 3
--drop existing tables
drop table expense;
drop table sess;
drop table assignment;
drop table task;
drop table stage;
drop table project;
drop table task_type;
drop table employee;
drop table grade;
--create new tables
create table grade
grade_no number(6) primary key,
description varchar2(50),
rate_per_hour number(5,2)
create table employee
employee_no number(6) primary key,
surname varchar2(50),
first_name varchar2(50),
grade_no number(6),
foreign key (grade_no) references grade(grade_no)
create table task_type
task_type_no number(6) primary key,
description varchar2(50),
grade_no number(6),
foreign key (grade_no) references grade(grade_no)
create table project
project_no number(6) primary key,
project_code varchar2(50),
client varchar2(50),
description varchar2(50),
manager number(6),
foreign key (manager) references employee(employee_no)
create table stage
project_no number(6),
stage_no number(6),
description varchar2(50),
Start_date date,
planned_Duration number(6,1),
fees_basis varchar2(2),
primary key (project_no,stage_no),
foreign key (project_no) references project(project_no),
constraint fees_basis_ck check(fees_basis IN ('fq','vs','vn','cs','cn'))
create table task
project_no number(6),
stage_no number(6),
task_no number(6),
description varchar2(50),
estimated_hours number(6,2),
planned_start_date date,
max_duration number(6,2),
task_type_no number(6),
primary key (project_no,stage_no,task_no),
foreign key (project_no,stage_no) references stage(project_no,stage_no),
foreign key (task_type_no) references task_type(task_type_no)
create table Assignment
project_no number(6),
stage_no number(6),
task_no number(6),
employee_no number(6),
estimated_hours number(6),
primary key (project_no,stage_no,task_no,employee_no)
create Table Sess
Session_no number(6),
Session_date date,
actual_Hours number(6),
chargeable char(1),
project_no number(6),
stage_no number(6),
task_no number(6),
employee_no number(6),
primary key (Session_no),
Foreign key (project_no, stage_no, task_no, employee_no)
references Assignment(project_no, stage_no, task_no, employee_no),
constraint chargeable_sess check(chargeable IN ('y','n'))
create table expense
expense_no number(6),
description varchar2(50),
quantity number(4),
unit_cost number(4,2),
chargeable char(1),
project_no number(6),
primary key(expense_no),
foreign key(project_no) references project(project_no),
constraint chargeable_exp check(chargeable IN ('y','n'))
**********************************************************

Answer 1

<< ..
<< --Application Development and Database (AD&D)
<< --
take the '&' off your script,
oracle thinks you want to define variable D,
and obviously you don't want that