SQL, end to end.
Every core operation an analyst uses \u2014 explained, then run against a real Classic Models database, right in your browser.
The database \u00b7 6 tables
offices(office_code, city, country)
employees(emp_id, name, office_code, title)
customers(cust_code, name, city, country, credit_limit, sales_rep)
products(product_code, name, line, buy_price, msrp)
orders(order_id, cust_code, order_date, status)
orderdetails(order_id, product_code, qty, price)