Evaluation of SQL database creation Write an SQL file called create.sql to create the tables for the database below. Before creating them, delete any existing tables using DROP. Define all primary keys and foreign keys correctly.

Database description:

Three tables, worker, company, and works_for.

worker: stores worker details.
- Attributes: name, city, supervisor.
- name is the primary key.
- supervisor refers to another worker in the same table.
company: stores company details
- Attributes: name, city.
- name is the primary key.
works_for: links workers to companies and includes salary.
- Attributes: wname, cname, salary.
- Primary key: (wname, cname).
- wname refers to worker.name and cname refers to company.name.

Use insert.sql to guide data types (the content of this file is copied below). After creating all tables in PostgreSQL, load insert.sql to add rows to your database. The attribute order must match the description.

Important: Use attribute names exactly as given so that the automatic marking gives you full mark. You can use the following query to test your code on PostgreSQL and make sure you didn't make any spelling mistakes:
SELECT worker.name, worker.city, supervisor, wname, cname, salary, company.name, company.city FROM worker, works_for, company;
Do not include this code in your submission.

NOTE:

Running insert.sql should produce some expected errors, as commented in the file. These are intentional.
If you only get these errors you can ignore them. If you see no errors or different ones, your tables may be incorrect.
You are not allowed to modify insert.sql.

Once you are sure your SQL commands in create.sql are correct, copy the content of your file into the provided text box in this quiz.

---------------------------------------------------------
-- file: insert.sql
-- Inserting rows for workers database
---------------------------------------------------------

insert into Worker values
   ('Juan', 'Glasgow', NULL),
   ('Amelia', 'Glasgow', 'Juan'),
   ('George', 'Inverness', 'Juan'),
   ('David', 'Glasgow', 'Amelia'),
   ('Sara', 'Edinburgh', 'David'),
   ('Daniel', 'Edinburgh', 'Sara');  
	
---------------- These lines should give ERRORS -----------------------
insert into Worker values ('Daniel', 'Edinburgh', 'Sara');  -- this should produce an ERROR:  duplicate key value violates unique constraint
insert into Worker values ('test', 'Edinburgh', 'test2');  -- this should produce an ERROR:  insert or update on table "worker" violates foreign key constraint
-----------------------------------------------------------------------
	
insert into Company values
    ('Apple', 'Glasgow'),
    ('Mishop', 'Glasgow'),
    ('Greens', 'Stirling'),
    ('Alfa', 'Glasgow'),
    ('Beta', 'Edinburgh'),
	('Sony', 'Glasgow');    	

insert into Works_for values
   ('Juan', 'Apple',  10000.00),
   ('Amelia', 'Sony', 20000.00),
   ('Amelia', 'Apple', 10000.00),
   ('George', 'Apple', 10000.00),
   ('David', 'Alfa', 20000.00),
   ('Sara', 'Beta', 40000.00),
   ('Sara', 'Greens', 30000.00),
   ('David', 'Greens', 2000.00),
   ('Daniel', 'Greens', 10000.00),
   ('Daniel', 'Sony', 10000.00);	  

---------------- These lines should give ERRORS -----------------------
insert into Works_for values  ('worker1', 'Apple', 10000.00);  -- this should produce an ERROR:  insert or update on table "works_for" violates foreign key constraint
insert into Works_for values  ('Daniel', 'test', 10000.00);  -- this should produce an ERROR:  insert or update on table "works_for" violates foreign key constraint
-----------------------------------------------------------------------

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This should not produce any error -- Salary should be defined as a numeric value (float, decimal, etc.). -- Supervisor can be NULL as the president of the company may not have any supervisor. --------------------------------------------------------- insert into Worker values ('Daniel', 'Edinburgh', NULL), ('Juan', 'Edinburgh', NULL); insert into Company values ('Sony', 'Glasgow'); insert into Works_for values ('Daniel', 'Sony', 9000); insert into Works_for values ('Juan', 'Sony', 10000); SELECT worker.name, worker.city, supervisor, wname, cname, cast(salary as integer), company.name, company.city FROM worker, works_for, company order by salary; daniel edinburgh daniel sony 9000 sony glasgow.*juan edinburgh daniel sony 9000 sony glasgow.*daniel edinburgh juan sony 10000 sony glasgow.*juan edinburgh juan sony 10000 sony glasgow .headers off SHOW -- There should be a drop table for each table, in correct order --------------------------------------------------------- -- Inserting rows. This should not produce any error --------------------------------------------------------- insert into Worker values ('Daniel', 'Edinburgh', 'Daniel'); insert into Company values ('Sony', 'Glasgow'); insert into Works_for values ('Daniel', 'Sony', 10000.00); SELECT worker.name, worker.city, supervisor, wname, cname, company.name, company.city FROM worker, works_for, company; daniel edinburgh daniel daniel sony sony glasgow .headers off PRAGMA foreign_keys = ON; drop table if exists Works_for; drop table if exists Worker; drop table if exists Company; --------------------------------------------------------- -- Create tables --------------------------------------------------------- create table Worker( Name varchar(50) primary key ); create table Company( Name varchar(50) primary key ); create table Works_for( WName varchar(50) not null, CName varchar(50) not null, constraint workerforFK1 foreign key (wname) references worker(name), constraint workerforFK2 foreign key (cname) references company(name) ); insert into Worker values ('Daniel'); insert into Company values ('Sony'); insert into Works_for values ('Daniel', 'Sony'); SHOW -- Tables should be dropped only if they exist --------------------------------------------------------- insert into Worker values ('Daniel', 'Edinburgh', 'Daniel'); insert into Company values ('Sony', 'Glasgow'); insert into Works_for values ('Daniel', 'Sony', 10000.00); SELECT worker.name, worker.city, supervisor, wname, cname, company.name, company.city FROM worker, works_for, company; \Adaniel edinburgh daniel daniel sony sony glasgow .headers off drop table if exists Works_for; drop table if exists Worker; drop table if exists Company; --------------------------------------------------------- -- Create tables --------------------------------------------------------- create table Company( Name varchar(50) primary key ); insert into Company values ('Sony'); SHOW -- Testing primary key of Worker. -- The following inserts should produce an ERROR if -- the key is defined correctly: -- duplicate key value violates unique constraint --------------------------------------------------------- insert into Worker values ('Juan', 'Glasgow', 'Juan'); insert into Worker values ('Juan', 'Glasgow', 'Juan'); error: unique constraint failed: worker.name SHOW -- Testing primary key of Company -- The following inserts should produce an ERROR if -- the key is defined correctly: -- duplicate key value violates unique constraint --------------------------------------------------------- insert into Company values ('Company 1', 'Glasgow'); insert into Company values ('Company 1', 'Glasgow'); error: unique constraint failed: company.name SHOW -- Testing primary key of Works_for -- There should be a primary key defined on worker name and company namer. -- The following inserts should produce an ERROR if -- the key is defined correctly: -- duplicate key value violates unique constraint --------------------------------------------------------- insert into Worker values ('Juan', 'Glasgow', 'Juan'); insert into Company values ('Company 1', 'Glasgow'); insert into Works_for values ('Juan', 'Company 1', 10000.00); insert into Works_for values ('Juan', 'Company 1', 10000.00); error: unique constraint failed: works_for.wname, works_for.cname SHOW error: foreign key constraint failed PRAGMA foreign_keys = ON; SHOW error: foreign key constraint failed PRAGMA foreign_keys = ON; SHOW error: foreign key constraint failed PRAGMA foreign_keys = ON; SHOW 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