NewId function produces a number which is guaranteed to be
unique across all databases and is suitable for constructing the
document ID part of a Reference.
FQL does not provide random number generation, as its operations attempt to be as deterministic as possible.
If you need a source of random numbers, your host language or browser can provide high-performance random number generation. Once you have generated a random number, you can then use it within your queries in deterministic fashion.
A unique numeric String.
The following query returns a unique string-encoded 64-bit integer:
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