ZCOUNT key min max
#Example
redis> ZADD myzset 1 "one"
(integer) 1
redis> ZADD myzset 2 "two"
(integer) 1
redis> ZADD myzset 3 "three"
(integer) 1
redis> ZCOUNT myzset -inf +inf
(integer) 3
redis> ZCOUNT myzset (1 3
(integer) 2
Count the members in a sorted set with scores within the given values
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