Returns the index of a member in a sorted set ordered by ascending scores.
ZRANK
key member
[WITHSCORE
]
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.
One of the following:
Nil reply: if the key does not exist or the member does not exist in the sorted set.
Integer reply: the rank of the member when WITHSCORE is not used.
Array reply: the rank and score of the member when WITHSCORE is used.
One of the following:
Null reply: if the key does not exist or the member does not exist in the sorted set.
Integer reply: the rank of the member when WITHSCORE is not used.
Array reply: the rank and score of the member when WITHSCORE is used.
O(log(N))
@fast @read @sortedset
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)
WITHSCORE
argument.BZMPOP, BZPOPMAX, BZPOPMIN, ZADD, ZCARD, ZCOUNT, ZDIFF, ZDIFFSTORE, ZINCRBY, ZINTER, ZINTERCARD, ZINTERSTORE, ZLEXCOUNT, ZMPOP, ZMSCORE, ZPOPMAX, ZPOPMIN, ZRANDMEMBER, ZRANGE, ZRANGESTORE, ZREM, ZREMRANGEBYLEX, ZREMRANGEBYRANK, ZREMRANGEBYSCORE, ZREVRANK, ZSCAN, ZSCORE, ZUNION, ZUNIONSTORE.