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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.
Could some SQL guru explain please why some people have an error when customer email is not present in GROUP BY and other people don't?
Is this static import reasonable here? IMO method of() in this case is not obvious without reading import statement
The string <" * " + num + " = "> is the same all the time but built 10 times
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