EasySQL challenge #70ORDER BYLIMIT

Top Rated Products Limit

Find top 10 highest rated products.

The challenge runs on the SQLabHub practice database (SQLite) and uses the products table. You can solve it in the browser, with nothing to install.

Solve This SQL Challenge

The task

Find top 10 highest rated products.

A correct answer returns 10 rows with 10 columns: id, name, category, price, cost, stock, sku, status, rating, review_count.

Tables used in this challenge

`products` 120 rows

id INTEGER (PK) · name TEXT · category TEXT · price REAL · cost REAL · stock INTEGER · sku TEXT · status TEXT · rating REAL · review_count INTEGER

First 3 rows of the products table
id	name	category	price	cost	stock	sku	status	rating	review_count
1	Play Kitchen Deluxe	Toys	1786.38	589.51	257	SKU-000001	active	4	57
2	Micro-Cut Paper Shredder 8-Sheet	Office Supplies	907.93	281.46	131	SKU-000002	active	2.5	447
3	4K Dual Dash Camera	Automotive	568.89	204.8	176	SKU-000003	active	4.1	29

The first rows of each table are shown. See how all the tables relate on the database schema page.

Expected output

Expected output of the challenge
id	name	category	price	cost	stock	sku	status	rating	review_count
5	Premium Beard Oil 60ml	Health & Beauty	1428.31	428.49	183	SKU-000005	active	5	305
14	Play Kitchen Deluxe	Toys	1840.63	773.06	366	SKU-000014	active	5	40
15	Japanese Green Tea 50 bags	Food & Beverage	1810.45	995.75	206	SKU-000015	active	5	300
47	The Manager's Path	Books	492.97	182.4	244	SKU-000047	active	5	440
95	SPF 50 Mineral Sunscreen	Health & Beauty	282.25	141.13	325	SKU-000095	active	5	344
120	Laptop Pro 15"	Electronics	517.2	248.26	147	SKU-000120	active	5	462
62	The Pragmatic Programmer	Books	1560.34	702.15	221	SKU-000062	active	4.9	143
63	Zero to One (Thiel)	Books	283.91	90.85	477	SKU-000063	active	4.9	301
75	Artisan Hot Sauce Trio	Food & Beverage	1284.48	565.17	338	SKU-000075	active	4.9	241
110	The Manager's Path	Books	1979.28	989.64	48	SKU-000110	active	4.9	381

The complete result: 10 rows. This is the output of the model solution on the practice database.

What you practise

Returning every column of a table with SELECT *
Sorting the result with ORDER BY
Returning only the first rows with LIMIT

Hint and approach

Try the challenge first. Open these only when you need them.

Show the hint

ORDER BY rating DESC LIMIT

Show the step-by-step approach

How the model solution is built, in the order the database evaluates it:

Read from the products table.
Return every column with SELECT *.
Sort the result by rating descending.
Keep only the first 10 rows with LIMIT.

Model solution

Checking your session…

What to watch for

LIMIT. LIMIT without ORDER BY returns an arbitrary set of rows. LIMIT is also dialect-specific: SQL Server uses TOP and Oracle uses FETCH FIRST.
ORDER BY. Without ORDER BY the row order is not guaranteed, even if it looks stable. Rows that tie on the sort columns can come back in any order.
SELECT *. SELECT * is fine for exploring, but its output changes whenever a column is added to the table. Queries that feed a report should name their columns.