Yes, MongoDB is more flexible in some searches and in one particular indexing scenario - Postgres does not provide an index supporting range queries for arrays. But, it is not a common case by any means and there are workarounds.
p(x_n)&=a_0 + a_1 x_n + a_2 x_n^2 + \cdots a_n x_n^n = y_n\\
，这一点在同城约会中也有详细论述
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