1) SELECT COUNT(*) FROM users;
    50


2) SELECT * FROM items ORDER BY price DESC LIMIT 5;
    25|Small Cotton Gloves|Automotive, Shoes & Beauty|Multi-layered modular service-desk|9984
    83|Small Wooden Computer|Health|Re-engineered fault-tolerant adapter|9859
    100|Awesome Granite Pants|Toys & Books|Upgradable 24/7 access|9790
    40|Sleek Wooden Hat|Music & Baby|Quality-focused heuristic info-mediaries|9390
    60|Ergonomic Steel Car|Books & Outdoors|Enterprise-wide secondary firmware|9341


3) SELECT * FROM items WHERE category = 'Books' ORDER BY price LIMIT 1;
    76|Ergonomic Granite Chair|Books|De-engineered bi-directional portal|1496
   SELECT * FROM items WHERE category LIKE '%Books%' ORDER BY price LIMIT 1;
    76|Ergonomic Granite Chair|Books|De-engineered bi-directional portal|1496


4) SELECT * FROM addresses WHERE street = '6439 Zetta Hills';
    43|40|6439 Zetta Hills|Willmouth|WY|15029
    user_id = 40
    SELECT * FROM users WHERE id = '40';
    40|Corrine|Little|rubie_kovacek@grimes.net
    Corrine Little lives there.

  SELECT * FROM addresses WHERE user_id = '40';
    43|40|6439 Zetta Hills|Willmouth|WY|15029
    44|40|54369 Wolff Forges|Lake Bryon|CA|31587


5) SELECT * FROM users WHERE first_name = 'Virginie';
    39|Virginie|Mitchell|daisy.crist@altenwerthmonahan.biz

   SELECT * FROM addresses WHERE user_id = '39';
    41|39|12263 Jake Crossing|New York|NY|10108
    42|39|83221 Mafalda Canyon|Bahringerland|WY|24028

    UPDATE addresses SET zip = '12345' WHERE id = '41';

    SELECT * FROM addresses WHERE user_id = '39';
    41|39|12263 Jake Crossing|New York|NY|12345
    42|39|83221 Mafalda Canyon|Bahringerland|WY|24028


6) SELECT SUM(quantity) FROM orders;
    2125


7) INSERT INTO users (id, first_name, last_name, email) VALUES ('123456', 'Brian', 'Gates', 'brian.gates@theironyard.com');
   INSERT INTO orders (id, user_id, item_id, quantity, created_at) VALUES ('654321', '123456', '40', '11', '5:34');