Feature4/add join visits table #11
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mateo951
approved these changes
Jun 19, 2022
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Hi @OmarRamoun,
Your project is complete! There is nothing else to say other than... it's time to merge it 🚀
Congratulations! 🎉
Cheers and Happy coding!👏👏👏
Feel free to leave any questions or comments in the PR thread if something is not 100% clear.
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| CREATE TABLE vets ( | ||
| vet_id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY NOT NULL, | ||
| name VARCHAR(255) NOT NULL, | ||
| age INT NOT NULL, | ||
| date_of_graduation DATE NOT NULL | ||
| ); | ||
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| /* | ||
| * There is a many-to-many relationship between the tables species and vets: a vet can specialize in multiple species, and a species can have multiple vets specialized in it. Create a "join table" called specializations to handle the relationship many-to-many relationship between the tables species and vets. | ||
| - id: integer (set it as autoincremented PRIMARY KEY) | ||
| - vet_id: integer (foreign key referencing vets table) | ||
| - species_id: integer (foreign key referencing species table) | ||
| */ | ||
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| CREATE TABLE specializations ( | ||
| specialization_id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY NOT NULL, | ||
| vet_id BIGINT REFERENCES vets(vet_id) ON DELETE CASCADE, | ||
| species_id BIGINT REFERENCES species(species_id) ON DELETE CASCADE | ||
| ); |
There was a problem hiding this comment.
You added the new tables with the appropriate columns 🙌
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| INSERT INTO vets | ||
| (full_name, age, graduation_date) | ||
| VALUES ('Vet William Tatcher', 45, DATE '2000-04-23'); | ||
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| Insert INTO vets | ||
| (full_name, age, graduation_date) | ||
| VALUES ('Vet Maisy Smith', 26, DATE '2019-01-17'); | ||
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| Insert INTO vets | ||
| (full_name, age, graduation_date) | ||
| VALUES ('Vet Stephanie Mendez', 64, DATE '1981-05-04'); | ||
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| INSERT INTO vets | ||
| (full_name, age, graduation_date) | ||
| VALUES ('Vet Jack Harkness', 38, DATE '2008-06-08'); |
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| SELECT owners.full_name, animals.name FROM owners | ||
| JOIN animals USING (owner_id) | ||
| WHERE animals.name = (SELECT animals.name FROM animals | ||
| JOIN visits USING (animal_id) | ||
| JOIN vets USING (vet_id) | ||
| WHERE vets.full_name = 'William Tatcher' | ||
| ORDER BY visits.date_of_visit DESC | ||
| LIMIT 1) | ||
| ORDER BY owners.full_name; | ||
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| SELECT COUNT(DISTINCT animals.name) FROM animals | ||
| JOIN visits USING (animal_id) | ||
| JOIN vets USING (vet_id) | ||
| WHERE vets.full_name = 'Stephanie Mendez'; | ||
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| SELECT vets.full_name, vets.specialty FROM vets | ||
| JOIN visits USING (vet_id) | ||
| JOIN animals USING (animal_id) | ||
| WHERE EXTRACT(MONTH FROM visits.date_of_visit) >= 4 AND EXTRACT(MONTH FROM visits.date_of_visit) <= 8 | ||
| AND EXTRACT(YEAR FROM visits.date_of_visit) >= 2020 | ||
| GROUP BY vets.full_name, vets.specialty; | ||
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| SELECT animals.name, visits.date_of_visit FROM animals | ||
| JOIN visits USING (animal_id) | ||
| JOIN vets USING (vet_id) | ||
| WHERE visits.date_of_visit = (SELECT visits.date_of_visit FROM visits | ||
| JOIN vets USING (vet_id) | ||
| JOIN animals USING (animal_id) | ||
| WHERE animals.name = 'Maisy Smith' | ||
| ORDER BY visits.date_of_visit DESC | ||
| LIMIT 1) | ||
| ORDER BY animals.name; | ||
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| SELECT COUNT(*) FROM visits | ||
| JOIN vets USING (vet_id) | ||
| WHERE vets.specialty != (SELECT vets.specialty FROM vets | ||
| JOIN visits USING (vet_id) | ||
| JOIN animals USING (animal_id) | ||
| WHERE animals.name = 'Maisy Smith' | ||
| ORDER BY visits.date_of_visit DESC | ||
| LIMIT 1) | ||
| ORDER BY COUNT(*) DESC; | ||
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| SELECT vets.specialty FROM vets | ||
| JOIN visits USING (vet_id) | ||
| JOIN animals USING (animal_id) | ||
| WHERE animals.name = 'Maisy Smith' | ||
| ORDER BY visits.date_of_visit DESC | ||
| LIMIT 1; |
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Thank you so much @mateo951
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✔️ Insert the following data for vets:
✔️ Insert the following data for specialties:
✔️ Insert the following data for visits:
✔️ Write queries to answer the following: