zset 类型

zset 常用命令

• zadd key score element O(logn)element 不能重复，score 可以重复；
• zrem key element O(1)
• zscore key element
• zincrby key increScore element
• zcard key O(1)
• zrank key element
• zrange key start end withscores O(log(n)+m)
• zrangebyscore key minScore maxScore
• zcount key minScore maxScore O(log(n)+m)
• zremrangebyrank key start end
• zremrangebyscore key minScore maxScore

zset 其他命令

• zrevrank
• zrevrange
• zrevrangebyscore
• zinterstore
• zunionstore

实战

• 排行榜可以用 zset 实现；