ZRANGEBYSCORE for score-based queries in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the Redis command ZRANGEBYSCORE do?

It returns all the members in a sorted set with scores within a given range, ordered from lowest to highest score.

intermediate

How do you specify the score range in ZRANGEBYSCORE?

You provide two arguments: the minimum score and the maximum score. You can use parentheses to exclude a boundary (e.g., (5 means greater than 5).

beginner

What does the syntax ZRANGEBYSCORE key min max WITHSCORES return?

It returns the members with scores between min and max along with their scores.

intermediate

How can you limit the number of results returned by ZRANGEBYSCORE?

By adding the LIMIT offset count option after the score range to return a subset of matching members.

beginner

Why is ZRANGEBYSCORE useful in real-life applications?

It helps retrieve items like top scores, events in a time range, or ranked data efficiently based on numeric scores.

What does ZRANGEBYSCORE myset 10 20 return?

A All members regardless of score

B Members with scores between 10 and 20 inclusive

C Members with scores less than 10 or greater than 20

D Members with scores exactly 10 or 20 only

ZRANGEBYSCORE returns members with scores between the min and max values, including both boundaries by default.

How do you exclude the minimum score 5 in ZRANGEBYSCORE?

A Use (5

B Use 5

C Use [5

D Use >5

Using (5 means scores strictly greater than 5, excluding 5 itself.

Which option returns scores along with members?

A SCORES

B LIMIT

C WITHSCORES

D INCLUDE

WITHSCORES tells Redis to return each member's score along with the member.

What does LIMIT 0 3 do in ZRANGEBYSCORE?

A Limits scores to 0 or 3 only

B Skips the first 3 members

C Returns members with scores 0 to 3

D Returns the first 3 matching members

LIMIT offset count returns count members starting from offset 0, so first 3 members.

Which data structure does ZRANGEBYSCORE work on?

A Sorted Sets

B Lists

C Hashes

D Strings

ZRANGEBYSCORE works on sorted sets, which store members with scores.

Explain how to use ZRANGEBYSCORE to get members with scores between 50 and 100, including how to exclude the lower bound.

Think about how to write the min argument to exclude 50.

Describe a real-life scenario where ZRANGEBYSCORE would be helpful and how you would use it.

Consider a game or event timeline.