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) 1redis> ZADD myzset 2 "two"

(integer) 1redis> ZADD myzset 3 "three"

(integer) 1redis> ZCOUNT myzset -inf +inf

(integer) 3redis> ZCOUNT myzset (1 3

(integer) 2