获取排序集中的所有成员

我有一个已排序的集合，并希望获取集合的所有成员。如何识别命令的最大/最小得分:

zrange key min max

？

redis

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最佳答案

You're in luck, as zrange does not take scores, but indices. 0 is the first index, and -1 will be interpreted as the last index:

zrange key 0 -1

To get a range by score, you would call zrangebyscore instead -- where -inf and +inf can be used to denote negative and positive infinity, respectively, as Didier Spezia notes in his comment:

zrangebyscore key -inf +inf

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In newer versions of redis (>= v6.2.0), if you want to get all members of a sorted set between two scores, you should use:

ZRANGE key min max BYSCORE

Adding the BYSCORE option makes redis treat the min & max arguments as scores rather than indices.

(As of this writing, ZRANGEBYSCORE still works, but is considered deprecated.)

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Starting with Redis 6.2.0,

To get all the keys and its value together in a single query using the below,

zrange <KEY> 0 -1 WITHSCORES

The optional WITHSCORES argument supplements the command's reply with the scores of elements returned. The returned list contains value1,score1,...,valueN,scoreN instead of value1,...,valueN. Client libraries can return a more appropriate data type (suggestion: an array with (value, score) arrays/tuples).