Redis

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.

Examples

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
redis> 
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