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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.
Ohhh, things are not so simple. Firstly when you search data by the condition of the range you almost always get full table scan, the second important factor is the availability of a index by the field, order of the fields in the index, type and parameters of index, the third is the implementation of a query optimizer in a concrete database.