Sorted Set
ZCOUNT
Returns the number of elements in the sorted set stored at key filterd by score.
Arguments
The key to get.
The minimum score to filter by.
Use -inf to effectively ignore this filter.
Use (number to exclude the value.
The maximum score to filter by.
Use +inf to effectively ignore this filter.
Use (number to exclude the value.
Response
The number of elements where score is between min and max.
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