Comparing two sorted sets

Redis commands & data structures
1

Hi,

I have two sorted sets, z1 and z2, with the same elements but different scores.

How would I compare the scores of set z1 with those of z2, and list only those with the highest scores of set z1 with respect to z2?

I can use only Redis commands

Thanks

2

This sounds like a class assignment!

I think want you want to do look at ZUNIONSTORE with the AGGREGATE MAX argument.

3

@JRedis2020

See, if it helps:

redis> ZADD z1 100 player:1

(integer) 1

redis> ZADD z1 120 player:2

(integer) 1

redis> ZADD z1 90 player:3

(integer) 1

redis> ZADD z2 180 player:1

(integer) 1

redis> ZADD z2 160 player:3

(integer) 1

redis> ZADD z2 140 player:2

(integer) 1

redis> ZUNIONSTORE finalset 2 z1 z2

(integer) 3

redis> ZRANGE finalset 0 -1 WITHSCORES

1) "player:3" 2) "250" 3) "player:2" 4) "260" 5) "player:1" 6) "280"

redis> ZREVRANGE finalset 0 -1 WITHSCORES

1) "player:1" 2) "280" 3) "player:2" 4) "260" 5) "player:3" 6) "250"