Redis zrange和zrangebyscore

Question

这两个Redis命令是否不同,除了第二个具有可选LIMIT参数？ http://redis.io/commands/zrange http://redis.io/commands/zrangebyscore

Answer 1

它们是不同的:

• ZRANGE key start stop ...:start并且stop是从零开始的索引(即它们对应于有序集合中元素的位置),
• ZRANGEBYSCORE key min max ...:min并max参考分数(即它们用于指定分数范围).

因此,第一个按索引操作,而第二个(顾名思义)按分数操作.因此,它们用于不同的目的.

Answer 2

说，排序集是：

value score
tom 0
bob 1
alice 100
lucy 102

when you use zrangebyscores, and the max score is 2, the min score is 0, then, you will get tom and bob;

when you use zrange, and the start is 0, the stop is 2, then you will get tom, bob and alice.

127.0.0.1:6379> zadd example 0 tom 1 bob 100 alice 102 lucy
127.0.0.1:6379> zrange example 0 2 WITHSCORES
1) "tom"
2) "0"
3) "bob"
4) "1"
5) "alice"
6) "100"
127.0.0.1:6379> zrangebyscore example 0 2 WITHSCORES
1) "tom"
2) "0"
3) "bob"
4) "1"

this is the key difference.