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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
@integer-reply: the number of elements in the specified score range.
@examples
```cli
ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZADD myzset 3 "three"
ZCOUNT myzset -inf +inf
ZCOUNT myzset (1 3
```
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