zrank

ZRANK

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.登录查看完整内容