Waymark / Routes / redis.io Create a Redis sorted set and add/update member scores with ZADD
domain: redis.io · 7 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps ZADD key score member [score member ...] adds members and creates the key if it doesn't exist. Example: ZADD leaderboard 100 "alice" 205 "bob". Update an existing member's score by passing the same member with a new score (it is repositioned automatically). Use NX to only add new members, or XX to only update existing ones (Redis 3.0.2+, mutually exclusive). GT/LT (Redis 6.2+) update only when the new score is greater/less than the current one. INCR increments the score in place (like ZINCRBY) — but then only one score/member pair is allowed. CH makes the reply count changed members (added + updated) instead of just added. Known gotchas Scores are double-precision floats; integers are exact only up to ±2^53 — larger values or fractions may come back approximated. Members are unique — re-adding updates the score, it never duplicates the member. Members with equal scores are ordered lexicographically (binary byte comparison). O(log(N)) per item. Errors with WRONGTYPE if the key exists but isn't a sorted set.
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