1. Get all restaurants Write a query that returns all of the restaurants, with all of the fields.
SELECT * FROM restaurants
2. Get Italian restaurants Write a query that returns all of the Italian restaurants, with all of the fields
SELECT * FROM restaurants where cuisine = 'Italian'
3. Get 10 Italian restaurants, subset of fields Write a query that gets 10 Italian restaurants, returning only the id and name fields.
SELECT id, name FROM restaurants where cuisine = 'Italian' limit 10
4. Count of Thai restaurants Write a query that returns the number of Thai restaurants.
SELECT COUNT(*) FROM restaurants where cuisine = 'Thai'
5. Count of restaurants Write a query that returns the total number of restaurants.
SELECT COUNT(*) FROM restaurants
6. Count of Thai restaurants in zip code Write a query that returns the number of Thai restaurants in the 11372 zip code.
SELECT COUNT(*) FROM restaurants where cuisine = 'Thai' and address_zipcode = '11372'
7. Italian restaurants in one of several zip codes Write a query that returns the id and name of five Italian restaurants in the 10012, 10013, or 10014 zip codes. The initial results (before limiting to five) should be alphabetically sorted.
SELECT id,name FROM restaurants where cuisine = 'Italian' and address_zipcode IN ('10012', '10013', '10014') order by name asc limit 5
8. Create a restaurant Create a restaurant with the following properties:
- name: 'Byte Cafe',
- borough: 'Brooklyn',
- cuisine: 'coffee',
- address_building_number: '123',
- address_street: 'Atlantic Avenue',
- address_zipcode: '11231'
INSERT INTO restaurants (name,borough,cuisine,address_building_number,address_street,address_zipcode) VALUES ('Byte Cafe', 'Brooklyn','coffee','123','Atlantic Avenue','11231')
9. Create a restaurant and return id and name Create a restaurant with values of your choosing, and return the id and name.
INSERT INTO restaurants (name,borough,cuisine,address_building_number,address_street,address_zipcode) VALUES ('Example Cafe', 'Brooklyn','Itlian','123','Main Street','11231') RETURNING id,name
10. Create three restaurants and return id and name Create three restaurants using a single command, with values of your choosing, returning the id and name of each restaurant.
INSERT INTO restaurants (name,borough,cuisine,address_building_number,address_street,address_zipcode) values ('Example Cafe2', 'Brooklyn','Italian','123','Jefferson Street','12345'), ('Example Cafe3', 'Brooklyn','Italian','456','Jefferson Street','12345'), ('Example Cafe4', 'Brooklyn','Italian','789','Jefferson Street','12345') RETURNING id,name;
11. Update a record Update the record whose value for nyc_restaurant_id is '30191841'. Change the name from 'Dj Reynolds Pub And Restaurant' to 'DJ Reynolds Pub and Restaurant'.
update restaurants set name = 'DJ Reynolds Pub and Restaurant' where nyc_restaurant_id = '30191841'
12. Delete by id Delete the grade whose id is 10.
delete from grades where id ='10';
13. A blocked delete Try deleting the restaurant with id of 22. What error do you get?
SQL Error [23503]: ERROR: update or delete on table "restaurants" violates foreign key constraint "grades_restaurant_id_fkey" on table "grades" Detail: Key (id)=(22) is still referenced from table "grades".
14. Create a table Create a new table called inspectors with the following properties:
first_name: String of inspector's first name, required last_name: String of inspector's last name, required borough: The borough the inspector works in, not required, one of Bronx, Brooklyn, Manhattan, Queens, Staten Island. inspectors should also have a system generated primary key property, id.
Note that the borough property requires you to use an enumerated type, which is a list of set values you can use for a property. You can use an existing enumerated type that will already be in the table: borough_options.
create table inspectors ( id serial primary key, inspector_first_name text, inspector_last_name text, borough borough_options )
15. Update a table Add a notes field to the grades table. notes are not required, and are text.
ALTER TABLE grades ADD COLUMN notes text
16. Drop a table Drop the inspectors table from the database.
DROP TABLE inspectors