Sorted Sets

Scores plus uniqueness

Sorted sets (ZSETs) keep each member once and order them by a numeric score—perfect for leaderboards and delayed queues.

ZADD scores 100 alice 95 bob 120 cara
ZREVRANGE scores 0 2 WITHSCORES

Update and read ranks

Changing a score upserts the member. Ask for rank or score directly.

ZINCRBY scores 5 alice
ZSCORE scores alice
ZREVRANK scores alice

Range by score

Fetch everyone in a score window.

ZRANGEBYSCORE scores 90 110 WITHSCORES

When to use them

Prefer sorted sets when order by a number matters. Use plain sets when you only care about membership.