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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I would add that adding prices has no practical sense.
You get given the time in hours...Agreed
It's already implied.
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OMG! I spent a couple of hours solving this problem. Missed the mathematical connection. Excellent solution man!
Use spoiler flag next time, please
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That's why he uses COUNT(s) instead of SUM(s)
done
There is no advantage and this is not at all best practice, it just makes the query less readable.
The sql optimizer is so good that in 99.99999999999% of cases you never have to think about optimization, only readability.
corrected
What are some good ways to start learning python regular expressions.
x2
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