This community-built FAQ covers the “Code Challenge 3” exercise from the lesson “Code Challenge: Queries”.
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FAQs on the exercise Code Challenge 3
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I am still confused with how the AND statement works. I tried the following code, it didn’t work-
SELECT name, gender, number
WHERE year = 1880
AND ORDER BY number DESC
AND LIMIT 10;
What am I getting wrong? Is AND only to be used when you’re doing operations on two different columns ?
you don’t need to use AND in this case. AND is used when you’re joining multiple conditions, like: where… and… and…
I’m not fully understanding what GROUP BY does.
In the first query I leave out ‘GROUP BY name’ and the second one I include it. I’m not sure why there is a difference in query results. For instance, why is ‘John’ and ‘William’ not included in the second query results?
that´s an interesting question. i would have also expected the same result.
nevertheless name is the primary key, and grouping by a primary key does not really make sense, innit?