ZRANK key member

Available since 2.0.0.

Time complexity: O(log(N))

Returns the rank of member in the sorted set stored at key, with the scores ordered from low to high. The rank (or index) is 0-based, which means that the member with the lowest score has rank 0.

Use ZREVRANK to get the rank of an element with the scores ordered from high to low.

*Return value

  • If member exists in the sorted set, Integer reply: the rank of member.
  • If member does not exist in the sorted set or key does not exist, Bulk string reply: nil.

*Examples

redis>  ZADD myzset 1 "one" 
(integer) 1
redis>  ZADD myzset 2 "two" 
(integer) 1
redis>  ZADD myzset 3 "three" 
(integer) 1
redis>  ZRANK myzset "three" 
(integer) 2
redis>  ZRANK myzset "four" 
(nil)
redis>