ZCOUNT key min max
相关命令
- ZADD
- ZCARD
- ZCOUNT
- ZINCRBY
- ZINTERSTORE
- ZLEXCOUNT
- ZRANGE
- ZRANGEBYLEX
- ZRANGEBYSCORE
- ZRANK
- ZREM
- ZREMRANGEBYLEX
- ZREMRANGEBYRANK
- ZREMRANGEBYSCORE
- ZREVRANGE
- ZREVRANGEBYSCORE
- ZREVRANK
- ZSCAN
- ZSCORE
- ZUNIONSTORE
Available since 2.0.0.
时间复杂度: O(log(N)) with N being the number of elements in the sorted set.
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.
返回值
Integer reply: the number of elements in the specified score range.
例子
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
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