sql developer "%s: invalid identifier", error on foreign key - oracle-sqldeveloper

I'm creating two tables, the primary key of manager is the foreign key of employees, but I'm getting this error:
Error report -
SQL Error: ORA-00904: "MANAGER_ID": invalid identifier
00904. 00000 - "%s: invalid identifier".
create table managers(
manager_id number(9),
manager_name varchar(50),
primary key(manager_id)
);
create table employees
(
emp_id number(9),
emp_name varchar(50) not null,
primary key(emp_id),
foreign key(manager_id) references managers(manager_id)
);
Please help, thanks a lot.


Did you mean?
create table managers(
manager_id number(9),
manager_name varchar(50),
primary key(manager_id)
);
create table employees
(
emp_id number(9),
manager_id number(9),
emp_name varchar(50) not null,
primary key(emp_id),
foreign key(manager_id) references managers(manager_id)
);
because there is no manager_id in in employees table in your SQL statement.

Related

What is wrong with this Query ? PostgreSQL

I want to create 3 tables and join them with foreign keys. Unfortunately, it doesn't work and I have no idea where is a mistake.
CREATE TABLE Students (
Student_Id SERIAL PRIMARY KEY,
Name VARCHAR (20) NOT NULL,
Surname VARCHAR (30) NOT NULL,
Date_of_Birth DATE NOT NULL,
Phone INT NOT NULL UNIQUE,
Email VARCHAR(225) NOT NULL UNIQUE,
Course_Id INT
FOREIGN KEY (Course_Id) REFERENCES Course (Course_Id)
);
CREATE TABLE Course (
Course_Id SERIAL PRIMARY KEY,
Student_Id INT NOT NULL,
Teacher_Id INT NOT NULL,
Category VARCHAR (30) NOT NULL,
FOREIGN KEY (Student_Id) REFERENCES Students (Student_Id)
);
CREATE TABLE Teachers (
Teacher_Id SERIAL PRIMARY KEY,
Name VARCHAR (20) NOT NULL,
Surname VARCHAR (30) NOT NULL,
Phone INT NOT NULL UNIQUE,
Salary INT NOT NULL,
Course_Id INT NOT NULL,
FOREIGN KEY (Teacher_Id) REFERENCES Course (Teacher_Id)
);
I should create a Foreign Key to join all three tables.
I get this error every time: relation "course" does not exist
I can't find where is the mistake. Please help.

It appears like you are attempting to crate a many-to-many (M:M) between Students and Teachers with Course as the resolution table. You are close, however, your definition sets up bi-directional relationships. This is normally not necessary. Define Students and Teachers without the FK to Course. Then define Course with a FK to each.
create table students (
student_id serial primary key
, name varchar (20) not null
, surname varchar (30) not null
, date_of_birth date not null
, phone int not null unique
, email varchar(225) not null unique
);
create table teachers (
teacher_id serial primary key
, name varchar (20) not null
, surname varchar (30) not null
, phone int not null unique
, salary int not null
);
create table course (
course_id serial primary key
, student_id int not null
, teacher_id int not null
, category varchar (30) not null
, foreign key (student_id) references students (student_id)
, foreign key (teacher_id) references teachers (teacher_id)
, unique (student_id, teacher_id)
);
If you must define bi-directional FK in Students and Teachers then create the tables without the FK then use alter table after Course is defined to add the FK and make them DEFERRABLE INITIALLY DEFERRED. Necessary for eventual Inserts.
alter table teachers add column course_id int references course(course_id) deferrable initially deferred;
alter table students add column course_id int references course(course_id) deferrable initially deferred;

When I run this code a syntax error keeps appearing but I am unable to find where it would be

When I run this code, I receive a very vague syntax error: database: syntax error at or near "(". I am unable to find where this syntax error would be.
I have also been told that animal_adoption_history is not an associative entity when it was designed as one.
What have I done wrong when writing it?
The code:
DROP TABLE IF EXISTS customer;
DROP TABLE IF EXISTS animal;
DROP TABLE IF EXISTS animal_adoption_history;
create table customer (
customer_id CHAR(9) NOT NULL,
c_first_name VARCHAR(25),
c_last_name VARCHAR(50),
c_gender CHAR(1),
c_phone_number VARCHAR(20),
c_email_address VARCHAR(45),
c_date_of_birth DATE,
c_address_number VARCHAR(10),
c_street_name VARCHAR(30),
c_city VARCHAR(50),
c_state CHAR(3),
c_postcode CHAR(4),
c_has_adopted_before CHAR(1),
constraint customer_PK PRIMARY KEY (customer_id)
);
create table animal (
animal_id CHAR(9) NOT NULL,
a_animal_type VARCHAR(20) ,
a_breed VARCHAR(50),
a_colour VARCHAR(30),
a_size VARCHAR(20),
a_weight_kg VARCHAR(10),
a_description VARCHAR(75),
a_name VARCHAR(30),
a_date_of_birth DATE,
a_sex CHAR(1),
a_animal_cost INT(10),
a_microchip_status CHAR(1),
a_vaccination_status CHAR(1),
constraint animal_PK PRIMARY KEY (animal_id)
);
create table animal_adoption_history (
health_conditions VARCHAR(100),
is_available_to_adopt CHAR(1),
has_been_adopted_previously CHAR(1),
reason_for_entry VARCHAR(75),
date_entered DATE,
animal_id CHAR(9) NOT NULL,
customer_id CHAR(9) NOT NULL,
constraint animal_adoption_history_PK PRIMARY KEY (animal_id, customer_id),
constraint animal_adoption_history_FK1 FOREIGN KEY (animal) references animal(animal_id)
constraint animal_adoption_history_FK2 FOREIGN KEY (customer_id) references customer(customer_id)
);
INSERT INTO customer (customer_id,c_first_name,c_last_name,c_gender,c_phone_number,c_email_address,c_date_of_birth,c_address_number,c_street_name,c_city,c_state,c_postcode,c_has_adopted_before)
VALUES ('C00000001','Olivia','Smith','F','0422425392','olivia.smith#gmail.com','1980-06-22','2','Henderson Street','Bondi','NSW','2092','Yes');
INSERT INTO customer (customer_id,c_first_name,c_last_name,c_gender,c_phone_number,c_email_address,c_date_of_birth,c_address_number,c_street_name,c_city,c_state,c_postcode,c_has_adopted_before)
VALUES ('C00000002','Taylor','Brown','F','0422435394','taylor.brown#gmail.com','1999-02-24','62','Ultimo Avenue','Bondi','NSW','2092','No');
INSERT INTO customer (customer_id,c_first_name,c_last_name,c_gender,c_phone_number,c_email_address,c_date_of_birth,c_address_number,c_street_name,c_city,c_state,c_postcode,c_has_adopted_before)
VALUES ('C00000003','Sarah','Li','F','0422425342','sarah.li#gmail.com','1997-02-22','27','Winchester Street','Epping','NSW','2092','Yes');
INSERT INTO customer (customer_id,c_first_name,c_last_name,c_gender,c_phone_number,c_email_address,c_date_of_birth,c_address_number,c_street_name,c_city,c_state,c_postcode,c_has_adopted_before)
VALUES ('C00000004','Charlie','Swift','M','0432425392','charlie.swift#gmail.com','1998-02-22','22','Henderson Lane','Lindfield','NSW','2092','No');
INSERT INTO customer (customer_id,c_first_name,c_last_name,c_gender,c_phone_number,c_email_address,c_date_of_birth,c_address_number,c_street_name,c_city,c_state,c_postcode,c_has_adopted_before)
VALUES ('C00000005','Heath','Davidson','M','0422425911','heath.davidson#gmail.com','2003-01-22','22','Station Street','Manly','NSW','2092','Yes');
INSERT INTO animal (animal_id,a_animal_type,a_breed,a_colour,a_size,a_weight_kg,a_description,a_name,a_date_of_birth,a_sex,a_animal_cost,a_microchip_status,a_vaccination_status)
VALUES ('A00000001','Dog','Pug','Light brown','Small','5','Playful yet enjoys cuddles','Mia','2020-02-22','F','3100','Y','Y');
INSERT INTO animal (animal_id,a_animal_type,a_breed,a_colour,a_size,a_weight_kg,a_description,a_name,a_date_of_birth,a_sex,a_animal_cost,a_microchip_status,a_vaccination_status)
VALUES ('A00000002','Cat','Tabby','Orange','Small','4','Quiet and loves the sun','Garfield','2010-04-28','M','1400','Y','N');
INSERT INTO animal (animal_id,a_animal_type,a_breed,a_colour,a_size,a_weight_kg,a_description,a_name,a_date_of_birth,a_sex,a_animal_cost,a_microchip_status,a_vaccination_status)
VALUES ('A00000003','Bird','Budgie','Green and yellow','Extra Small','0.035','Very loud when hungry','Roody','11-14','F','1200','N','Y');
INSERT INTO animal (animal_id,a_animal_type,a_breed,a_colour,a_size,a_weight_kg,a_description,a_name,a_date_of_birth,a_sex,a_animal_cost,a_microchip_status,a_vaccination_status)
VALUES ('A00000004','Rabbit','Holland Lop','Light brown and white','Small','5','Fluffy and enjoys lettuce snacks','Thumper','2018-19-04','F','900','N','N');
INSERT INTO animal (animal_id,a_animal_type,a_breed,a_colour,a_size,a_weight_kg,a_description,a_name,a_date_of_birth,a_sex,a_animal_cost,a_microchip_status,a_vaccination_status)
VALUES ('A00000005','Dog','Golden Retriever','Dark blonde','Large','32','Loves going for long walks','Milo','2014-05-30','M','2500','Y','Y');
INSERT INTO animal_adoption_history (health_conditions,is_available_to_adopt,has_been_adopted_previously,reason_for_entry,date_entered,animal_id,customer_id)
VALUES ('None','Y','Y','Owner moved away','2021-08-18','A00000001','C00000001');
INSERT INTO animal_adoption_history (health_conditions,is_available_to_adopt,has_been_adopted_previously,reason_for_entry,date_entered,animal_id,customer_id)
VALUES ('None','N','N','Newborn looking for home','2022-07-13','A00000003','C00000005');
INSERT INTO animal_adoption_history (health_conditions,is_available_to_adopt,has_been_adopted_previously,reason_for_entry,date_entered,animal_id,customer_id)
VALUES ('Diabetes','Y','Y','Owner passed away','2019-11-01','A00000004','C00000001');
INSERT INTO animal_adoption_history (health_conditions,is_available_to_adopt,has_been_adopted_previously,reason_for_entry,date_entered,animal_id,customer_id)
VALUES ('None','Y','N','Previous household abuse','2014-09-19','A00000002','C00000004');
INSERT INTO animal_adoption_history (health_conditions,is_available_to_adopt,has_been_adopted_previously,reason_for_entry,date_entered,animal_id,customer_id)
VALUES ('Arthritis','Y','Y','Newborn looking for home','2016-04-26','A00000005','C00000002');
Thanks!

INT(10) is not valid datatype:
a_animal_cost INT(10)
There are other issues as well, you have to fix this.

You have a number of errors in your code. When running PostgreSQL only lists the first one, which in this case is the line a_animal_cost INT(10),. Integers are a fixed size so it is wrong to attempt to specify a size for it.
Also do not use char(1) for Yes ('Y') No ('N') fields. PostgreSQL has a native boolean data type for this purpose, so use it.
When deleting tables, you need to delete the lowest tables in the hierarchy first (foreign key etc).
Finally, you can chain multiple inserts as values together.
Putting all this together, I would recommend that you use something like this:
DROP TABLE IF EXISTS animal_adoption_history;
DROP TABLE IF EXISTS animal;
DROP TABLE IF EXISTS customer;
create table customer (
customer_id CHAR(9) NOT NULL,
c_first_name VARCHAR(25),
c_last_name VARCHAR(50),
c_gender CHAR(1),
c_phone_number VARCHAR(20),
c_email_address VARCHAR(45),
c_date_of_birth DATE,
c_address_number VARCHAR(10),
c_street_name VARCHAR(30),
c_city VARCHAR(50),
c_state CHAR(3),
c_postcode CHAR(4),
c_has_adopted_before boolean,
constraint customer_PK PRIMARY KEY (customer_id)
);
create table animal (
animal_id CHAR(9) NOT NULL,
a_animal_type VARCHAR(20) ,
a_breed VARCHAR(50),
a_colour VARCHAR(30),
a_size VARCHAR(20),
a_weight_kg VARCHAR(10),
a_description VARCHAR(75),
a_name VARCHAR(30),
a_date_of_birth DATE,
a_sex CHAR(1),
a_animal_cost INT,
a_microchip_status boolean,
a_vaccination_status boolean,
constraint animal_PK PRIMARY KEY (animal_id)
);
create table animal_adoption_history (
health_conditions VARCHAR(100),
is_available_to_adopt boolean,
has_been_adopted_previously boolean,
reason_for_entry VARCHAR(75),
date_entered DATE,
animal_id CHAR(9) NOT NULL,
customer_id CHAR(9) NOT NULL,
constraint animal_adoption_history_PK PRIMARY KEY (animal_id, customer_id),
constraint animal_adoption_history_FK1 FOREIGN KEY (animal_id) references animal(animal_id),
constraint animal_adoption_history_FK2 FOREIGN KEY (customer_id) references customer(customer_id)
);
INSERT INTO customer (customer_id,c_first_name,c_last_name,c_gender,c_phone_number,c_email_address,c_date_of_birth,c_address_number,
c_street_name,c_city,c_state,c_postcode,c_has_adopted_before) VALUES
('C00000001','Olivia','Smith','F','0422425392','olivia.smith#gmail.com','1980-06-22','2',
'Henderson Street','Bondi','NSW','2092',true),
('C00000002','Taylor','Brown','F','0422435394','taylor.brown#gmail.com','1999-02-24','62',
'Ultimo Avenue','Bondi','NSW','2092',false),
('C00000003','Sarah','Li','F','0422425342','sarah.li#gmail.com','1997-02-22','27',
'Winchester Street','Epping','NSW','2092',true),
('C00000004','Charlie','Swift','M','0432425392','charlie.swift#gmail.com','1998-02-22','22',
'Henderson Lane','Lindfield','NSW','2092',false),
('C00000005','Heath','Davidson','M','0422425911','heath.davidson#gmail.com','2003-01-22','22',
'Station Street','Manly','NSW','2092',true);
INSERT INTO animal (animal_id,a_animal_type,a_breed,a_colour,a_size,a_weight_kg,a_description,a_name,a_date_of_birth,
a_sex,a_animal_cost,a_microchip_status,a_vaccination_status) VALUES
('A00000001','Dog','Pug','Light brown','Small','5','Playful yet enjoys cuddles','Mia','2020-02-22',
'F','3100',true,true),
('A00000002','Cat','Tabby','Orange','Small','4','Quiet and loves the sun','Garfield','2010-04-28',
'M','1400',true,false),
('A00000003','Bird','Budgie','Green and yellow','Extra Small','0.035','Very loud when hungry','Roody','2020-11-14',
'F','1200',false,true),
('A00000004','Rabbit','Holland Lop','Light brown and white','Small','5','Fluffy and enjoys lettuce snacks','Thumper','2018-04-19',
'F','900',false,false),
('A00000005','Dog','Golden Retriever','Dark blonde','Large','32','Loves going for long walks','Milo','2014-05-30',
'M','2500',true,true);
INSERT INTO animal_adoption_history (health_conditions,is_available_to_adopt,has_been_adopted_previously,reason_for_entry,
date_entered,animal_id,customer_id) VALUES
('None',true,true,'Owner moved away','2021-08-18','A00000001','C00000001'),
('None',false,false,'Newborn looking for home','2022-07-13','A00000003','C00000005'),
('Diabetes',true,true,'Owner passed away','2019-11-01','A00000004','C00000001'),
('None',true,false,'Previous household abuse','2014-09-19','A00000002','C00000004'),
('Arthritis',true,true,'Newborn looking for home','2016-04-26','A00000005','C00000002');

creating a table with two foreign keys in consideration

CREATE TABLE youth(
yh_id int NOT NULL,
surname VARCHAR(30) NOT NULL,
post VARCHAR(30) NOT NULL,
PRIMARY KEY (yh_id), REFERENCES members (mbrs_id) FOREIGN KEY (mbrs_id);
ERROR: syntax error at or near "REFERENCES"
LINE 5: PRIMARY KEY (yh_id), REFERENCES members (mbrs_id) FOREIGN ...
^
SQL state: 42601
Character: 128

Here is an example with the correct syntax.
create table members (
mbrs_id int primary key);
CREATE TABLE youth(
yh_id int NOT NULL,
surname VARCHAR(30) NOT NULL,
post VARCHAR(30) NOT NULL,
CONSTRAINT pk_youth_yh_id PRIMARY KEY (yh_id),
CONSTRAINT fk_youth_members_mbrs_id FOREIGN KEY (yh_id) REFERENCES members (mbrs_id) );
✓
✓
insert into members values(1);
insert into youth values
(1,'Jones','manager');
1 rows affected
1 rows affected
insert into youth values
(2,'Smith','chairman');
ERROR: insert or update on table "youth" violates foreign key constraint "fk_youth_members_mbrs_id"
DETAIL: Key (yh_id)=(2) is not present in table "members".
db<>fiddle here

I want to resolve this error "no matching unique or primary key for this column-list"

CREATE TABLE EMP(EMP_ID NUMBER(5), F_NAME VARCHAR2(20) NOT NULL, L_NAME VARCHAR2(20) NOT NULL,
EMAIL VARCHAR2(20) NOT NULL, PHONE_NO NUMBER(10) NOT NULL, HIRE_DATE DATE NOT NULL,
JOB_ID NUMBER(5) NOT NULL, SALARY NUMBER(5) NOT NULL, COMMISSION_PCT NUMBER(5),
MANAGER_ID NUMBER(5) NOT NULL, DEPT_ID NUMBER(5) NOT NULL, PRIMARY KEY (EMP_ID),
CONSTRAINT FK_ED FOREIGN KEY (DEPT_ID) REFERENCES DEPT (DEPT_ID),
CONSTRAINT FK_EDM FOREIGN KEY (MANAGER_ID) REFERENCES DEPT (MANAGER_ID));
When I add this line it is throwing the error ORA-02270.
I have already created the table DEPT which includes dept_id as primary key and manager_id as not null. But when I use foreign key as dept_id there is no error but for manager_id it is throwing the error.
Please help me resolve this.

dept_id is a primary key in DEPT, so you can have a foreign key for it in EMP.
manager_id is just a not-null column in DEPT. As it is not part of the primary key in DEPT, you cannot have a foreign key for it in EMP.

Does postgresql require unique constraint names when defining FOREIGN KEYS

Here is my schema for database tables:
CREATE TABLE users (
user_id INTEGER NOT NULL,
device_id INTEGER,
user_points INTEGER,
cookie VARCHAR,
PRIMARY KEY (user_id)
);
CREATE TABLE admins (
admin_id INTEGER NOT NULL,
username VARCHAR,
password VARCHAR
);
CREATE TABLE admin_adventure (
adventure_id INTEGER NOT NULL,
admin_id INTEGER,
PRIMARY KEY (adventure_id)
);
CREATE TABLE adventures (
adventure_id INTEGER NOT NULL,
prize_id INTEGER,
novella_id INTEGER,
PRIMARY KEY (adventure_id)
);
Here I'm trying to define FOREIGN KEYS:
ALTER TABLE admin_adventure ADD FOREIGN KEY ( admin_id ) REFERENCES admins ( admin_id );
ALTER TABLE admin_adventure ADD FOREIGN KEY ( adventure_id ) REFERENCES adventures ( adventure_id );
And here is the error I get when trying to migrate with Flyway:
ERROR: there is no unique constraint matching given keys for
referenced table "admins"
Can someone explain what I'm doing wrong and why I get this error?

The error message is complaining that you are trying to link a foreign key to a column in another table which is not unique (e.g. a primary key). Try making the admin_id column in the admins table a primary key:
CREATE TABLE admins (
admin_id INTEGER NOT NULL,
username VARCHAR,
password VARCHAR,
PRIMARY KEY (admin_id)
);

Like the documentation says:
A foreign key must reference columns that either are a primary key or form a unique constraint.
So you must either
ALTER TABLE admins ADD PRIMARY KEY (admin_id);
or
ALTER TABLE admins ADD UNIQUE (admin_id);