Use Redis sorted sets for leaderboards and ranking with ZADD/ZRANGE/ZSCORE

domain: redis.io · 8 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗

Documented steps

  1. Add an element with a score: `ZADD myzset 1 "one"` (creates the set if absent; adding an existing member updates its score).
  2. Add several: `ZADD myzset 2 "two" 3 "three"`.
  3. List ascending: `ZRANGE myzset 0 -1`; with scores: `ZRANGE myzset 0 -1 WITHSCORES`.
  4. Top N highest scores (leaderboard): `ZREVRANGE myzset 0 9 WITHSCORES` (reverse).
  5. Get one element's score: `ZSCORE myzset "one"`.
  6. Increment a score relatively: `ZINCRBY myzset 5 "one"` - ideal for live ranking updates without a read-modify-write.
  7. Conditional update (since 6.2): `ZADD myzset GT score member` only updates if new score is greater; LT for less.
  8. python: `r.zadd('z',{'one':1})`, `r.zrevrange('z',0,9,withscores=True)`.

Known gotchas

Related routes

Use Redis lists as a queue with LPUSH/RPUSH/LRANGE and pop operations
redis.io · 8 steps · unrated
Use Redis lists as a queue with LPUSH/RPUSH/LRANGE and pop operations
redis.io · 8 steps · unrated

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