SQL Drills for Dakota and Tachyla

test.sql

-- -- 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 address_zipcode FROM restaurants WHERE address_zipcode = '11372' AND cuisine = 'Thai';
-- 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 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') RETURNING id, name;
-- 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 ('The Brook', 'Queens', 'american', '789', '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 ('newRecord 1', 'Queens', 'Thai', '111', 'Main Street', '11231'), ('newRecord 2', 'Brooklyn', 'Italian', '222', 'Main Street', '11231'), ('newRecord 3', 'Manhattan', 'Chinese', '333', 'Main Street', '11231') 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'
  RETURNING name, id;
-- 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?
-- Paste the error text for the answer. We'll learn about foreign key constraints in the next reading, but take two seconds and come up with your own theory about what this message means.
ERROR:  update or delete on table "restaurants" violates foreign key constraint "grades
_restaurant_id_fkey" on 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,
  first_name text NOT NULL,
  last_name text NOT NULL,
  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;