zcount

ZCOUNT

ZCOUNT key min max

Returns the number of elements in the sorted set at key with a score between min and max.

The min and max arguments have the same semantic as described for ZRANGEBYSCORE.

Note: the command has a complexity of just O(log(N)) because it uses elements ranks (see ZRANK) to get an idea of the range- Because of this there is no need to do a work proportional to the size of the range-

Return value

Integer reply: the number of elements in the specified score range.

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