Shulou(Shulou.com)06/01 Report--

# introduction to sort set (ordered set)

It has a weight parameter score more than set, so that the elements in the collection can be arranged in order by score, such as a sorted set that stores the scores of the whole class, whose collection value can be the student number of students, and score can be its examination score, so that when the data is inserted into the collection, it has been sorted naturally.

# Common commands

# create an ordered collection

> zadd set2 12 "aaa" # 12 is a score

(integer) 1

> zadd set2 30 "linux"

(integer) 1

> zadd set2 7 "python"

(integer) 1

> zadd set2 13 "nosql"

(integer) 1

# Delete elements

Zrem zseta 222Delete the specified element

Zremrangebyrank zseta 0 2 / / deletes the elements in the index range 0-2, sorting by score forward

Zremrangebyscore zseta 1 10 / / Delete elements with scores ranging from 1 to 10

# display elements

Zrank zseta 22 / / returns the index value of the element, which starts at 0 and is sorted forward by score

Zrevrank zseta 222ditto, except that it is sorted in reverse order of score

> zrange set2 0-1 # displays all elements in order

1) "python"

2) "aaa"

3) "nosql"

4) "linux"

> zrevrange set2 0-1 # reverse order

1) "linux"

2) "nosql"

3) "aaa"

4) "python"

Zrange zseta 0-1 withscores # can take a score

Zcard zseta / / returns the number of all elements in the collection

Zcount zseta 1 10 / / returns the number of elements with a score of 1-10

Zrangebyscore zseta 1 10 / / returns elements with a score of 1-10

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