CODEWITHSUNDEEP
redis
AhmedFaud
AhmedFaud

Reputation: 221

How get last data from sorted set?

I saw a Redis tutorial. For my case there is a function: ZREVRANGEBYSCORE But I dont understand how get last one data via this function.

I tried ZREVRANGEBYSCORE myzset 0 1 for get last data row

Upvotes: 5

Views: 5466

Answers (3)

ITW
ITW

Reputation: 482

how about ZREVRANGEBYSCORE myzset 0 0?

redis> zadd score 100 Kenny 100 May 20 Mary 100 Doe 50 Foo
(integer) 5

redis> zrevrange score 0 0
1) "William"

redis> zrevrangebyscore score +inf -inf
1) "William"
2) "May"
3) "Kenny"
4) "Doe"
5) "Mary"

redis> zrevrangebyscore score +inf -inf withscores
 1) "William"
 2) "100"
 3) "May"
 4) "100"
 5) "Kenny"
 6) "100"
 7) "Doe"
 8) "100"
 9) "Mary"
10) "20"

Upvotes: 0

sNICkerssss
sNICkerssss

Reputation: 6430

My example on Node.js. Get last 5 elements from sorted set.

redis.zadd('key1', 0, 'val0');
redis.zadd('key1', 2, 'val2');
redis.zadd('key1', 3, 'val3');
redis.zadd('key1', 4, 'val4');
redis.zadd('key1', 6, 'val6');
redis.zadd('key1', 8, 'val8');
redis.zadd('key1', 11, 'val11');
redis.zadd('key1', 21, 'val21');

setTimeout(() => {

    redis.zrange('key1', -5, -1, (error, result) => {
        console.log('result:', result);
    });

}, 1000);

Upvotes: -1

user142162
user142162

Reputation:

Assuming "last data" means the item with the largest score, use the ZREVRANGEBYSCORE command in the following manner:

ZREVRANGEBYSCORE <key> +inf -inf LIMIT 0 1

Upvotes: 9

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