ZCOUNT
ZCOUNT key min 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.
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
© 2009–2020 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
https://redis.io/commands/zcount