Erro ao criar o banco de dados

[Gideane Azevedo]

Boa tarde,

Estou tentando criar o banco de dados de teste que você disponibilizou para realizarmos o desafio de projeto, mas estou enfrentando uma sequência de erros.
Poderia me ajudar?

CREATE TABLE employee(
	Fname varchar(15) not null,
    Minit char,
    Lname varchar(15) not null,
    Ssn char(9) not null, 
    Bdate date,
    Address varchar(30),
    Sex char,
    Salary decimal(10,2),
    Super_ssn char(9),
    Dno int not null,
    constraint chk_salary_employee check (Salary> 2000.0),
    constraint pk_employee primary key (Ssn)
);

alter table employee 
	add constraint fk_employee 
	foreign key(Super_ssn) references employee(Ssn)
    on delete set null
    on update cascade;

alter table employee modify Dno int not null default 1;

desc employee;

create table departament(
	Dname varchar(15) not null,
    Dnumber int not null,
    Mgr_ssn char(9) not null,
    Mgr_start_date date, 
    Dept_create_date date,
    constraint chk_date_dept check (Dept_create_date < Mgr_start_date),
    constraint pk_dept primary key (Dnumber),
    constraint unique_name_dept unique(Dname),
    foreign key (Mgr_ssn) references employee(Ssn)
);

-- 'def', 'company_constraints', 'departament_ibfk_1', 'company_constraints', 'departament', 'FOREIGN KEY', 'YES'
-- modificar uma constraint: drop e add
alter table departament drop  departament_ibfk_1;
alter table departament 
		add constraint fk_dept foreign key(Mgr_ssn) references employee(Ssn)
        on update cascade;

desc departament;

create table dept_locations(
	Dnumber int not null,
	Dlocation varchar(15) not null,
    constraint pk_dept_locations primary key (Dnumber, Dlocation),
    constraint fk_dept_locations foreign key (Dnumber) references departament (Dnumber)
);

alter table dept_locations drop fk_dept_locations;

alter table dept_locations 
	add constraint fk_dept_locations foreign key (Dnumber) references departament(Dnumber)
	on delete cascade
    on update cascade;

create table project(
	Pname varchar(15) not null,
	Pnumber int not null,
    Plocation varchar(15),
    Dnum int not null,
    primary key (Pnumber),
    constraint unique_project unique (Pname),
    constraint fk_project foreign key (Dnum) references departament(Dnumber)
);


create table works_on(
	Essn char(9) not null,
    Pno int not null,
    Hours decimal(3,1) not null,
    primary key (Essn, Pno),
    constraint fk_employee_works_on foreign key (Essn) references employee(Ssn),
    constraint fk_project_works_on foreign key (Pno) references project(Pnumber)
);

drop table dependent;
create table dependent(
	Essn char(9) not null,
    Dependent_name varchar(15) not null,
    Sex char,
    Bdate date,
    Relationship varchar(8),
    primary key (Essn, Dependent_name),
    constraint fk_dependent foreign key (Essn) references employee(Ssn)
);

Quando eu adiciono o código aparece diversos erros, o primeiro é: Error 1091: Can't DROP 'departament_ibfk_1'; check that column/key exists.

Conseguiria me auxiliar?

[Dudu Verderio]

Oii, tem uma issue aberta com o mesmo problema, da uma olhadinha que desse jeito funcionou para mim.
#21