Sams Teach Yourself SQL in 10 Minutes (Fifth Edition) includes challenges at the end of some lessons. Solutions to the challenges are presented here. Just keep in mind that there is rarely one solution to a SQL challenge, so if your solutions look different but produce the desired result, that’s ok.

Lesson 5

Write a SQL statement to retrieve the vendor name (vend_name) from the Vendors table, returning only vendors in California (this requires filtering by both country (USA) and state (CA), after all, there could be a California outside of the USA). Here’s a hint, the filter requires matching strings.


SELECT vend_name
FROM Vendors
WHERE vend_country = 'USA' AND vend_state = 'CA';
Category: Lesson 5

Write a SQL statement to find all orders where at least 100 of items BR01, BR02, or BR03 were ordered. You’ll want to return order number (order_num), product id (prod_id), and quantity for the OrderItems table, filtering by both the product id and quantity. Here’s a hint, depending on how you write your filter, you may need to pay special attention to order of evaluation.


-- Solution 1
SELECT order_num, prod_id, quantity
FROM OrderItems
WHERE (prod_id='BR01' OR prod_id='BR02' OR prod_id='BR03')
 AND quantity >=100;

-- Solution 2
SELECT order_num, prod_id, quantity
FROM OrderItems
WHERE prod_id IN ('BR01','BR02','BR03')
 AND quantity >=100;

Category: Lesson 5

Now let’s revisit a challenge from the previous lesson. Write a SQL statement which returns the product name (prod_name) and price (prod_price) from Products for all products priced between 3 and 6. Use an AND, and sort the results by price.


SELECT prod_name, prod_price
FROM products
WHERE prod_price >= 3 AND prod_price <= 6
ORDER BY prod_price;
Category: Lesson 5

What is wrong with the following SQL statement? (Try to figure it out without running it):

SELECT vend_name
FROM Vendors
ORDER BY vend_name
WHERE vend_country = 'USA' AND vend_state = 'CA';

ORDER BY must came after any WHERE clause.

Category: Lesson 5

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