ZRANK

Usage:

ZRANK key member [ WITHSCORE ]

Complexity:

O(log(N))

Since:

2.0.0

ACL Categories:

@fast, @read, @sortedset

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.

The optional WITHSCORE argument supplements the command's reply with the score of the element returned.

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

Reply

One of the following:

• Null: if the key does not exist or the member does not exist in the sorted set.
• Integer: the rank of the member when WITHSCORE is not used.
• Array: the rank and score of the member when WITHSCORE is used.

Examples

127.0.0.1:6379> ZADD myzset 1 "one"
(integer) 1
127.0.0.1:6379> ZADD myzset 2 "two"
(integer) 1
127.0.0.1:6379> ZADD myzset 3 "three"
(integer) 1
127.0.0.1:6379> ZRANK myzset "three"
(integer) 2
127.0.0.1:6379> ZRANK myzset "four"
(nil)
127.0.0.1:6379> ZRANK myzset "three" WITHSCORE
1) (integer) 2
2) "3"
127.0.0.1:6379> ZRANK myzset "four" WITHSCORE
(nil)

History

Version	Change
7.2.0	Added the optional WITHSCORE argument.