ZRANGE key start stop [WITHSCORES]

相关命令

Available since 1.2.0.

时间复杂度： O(log(N)+M) with N being the number of elements in the sorted set and M the number of elements returned.

Returns the specified range of elements in the sorted set stored at key. The elements are considered to be ordered from the lowest to the highest score. Lexicographical order is used for elements with equal score.

See ZREVRANGE when you need the elements ordered from highest to lowest score (and descending lexicographical order for elements with equal score).

Both start and stop are zero-based indexes, where 0 is the first element, 1 is the next element and so on. They can also be negative numbers indicating offsets from the end of the sorted set, with -1 being the last element of the sorted set, -2 the penultimate element and so on.

Out of range indexes will not produce an error. If start is larger than the largest index in the sorted set, or start > stop, an empty list is returned. If stop is larger than the end of the sorted set Redis will treat it like it is the last element of the sorted set.

It is possible to pass the WITHSCORES option in order to return the scores of the elements together with the elements. The returned list will contain value1,score1,…,valueN,scoreN instead of value1,…,valueN. Client libraries are free to return a more appropriate data type (suggestion: an array with (value, score) arrays/tuples).

返回值

Array reply: list of elements in the specified range (optionally with their scores).

例子

redis> ZADD myzset 1 "one"

(integer) 1

redis> ZADD myzset 2 "two"

(integer) 1

redis> ZADD myzset 3 "three"

(integer) 1

redis> ZRANGE myzset 0 -1

1) "one"
2) "two"
3) "three"

redis> ZRANGE myzset 2 3

1) "three"

redis> ZRANGE myzset -2 -1

1) "two"
2) "three"

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