ZRANK

ZRANK key member 

#Example

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) 

Determine the index of a member in a sorted set