ZCOUNT – Redis

Available since 2.0.0.

Time complexity: O(log(N)+M) with N being the number of elements in the sorted set and M being the number of elements between min and 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.

Return value

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

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