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[redis] sortedset type

2022-06-29 01:58:00 【Riding a snail chasing a missile '】

List of articles

One 、SortedSet type

One 、SortedSet type

Redis Of SortedSet It's a sortable set aggregate , And Java Medium TreeSet Some similar , But the underlying data structure is very different .SortedSet Each element in the has a score attribute , Can be based on score Attribute to sort elements , The underlying implementation is a jump table （SkipList) Add hash surface .SortedSet It has the following characteristics :

Sortable
Elements do not repeat
Fast query speed

because SortedSet Sortable properties of , Often used to implement functions like leaderboards .

1.1 ZADD & ZREM & ZCRAD

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ZADD key score member: Add one or more elements to sorted set, If it already exists, update its score value
ZREM key member: Delete sorted set A specified element in
ZCARD key: obtain sorted set The number of elements in

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1.2 ZSCORE & ZRANK

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ZSCORE key member: obtain sorted set Of the specified element in score value
ZRANK key member: obtain sorted set The ranking of the specified elements in

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1.3 ZCOUNT & ZRANGE & ZRANGEBYSCORE

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ZCOUNT key min max: Statistics score The number of all elements whose values are within a given range
ZRANGE key min max: according to score After ordering , Get the elements within the specified ranking range
ZRANGEBYSCORE key min max: according to score After ordering , Get specified score Elements in scope

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1.4 ZDIFF & ZINTER & ZUNION

ZDIFF、ZINTER、ZUNION: Difference set 、 intersection 、 Combine

1.5 Case study

Save the scores of the following students in the class into Redis Of SortedSet in : Jack 85,Lucy 89,Tom 82, Tom 95,Jerry 78,Amy 92,Miles 76· And realize the following functions :

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