zcount

ZCOUNT

ZCOUNT key min max

Available since 2.0.0.

Time complexity: 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-

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

© 2009–2017 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
https://redis.io/commands/zcount