如何使用zrangebyscore通过其得分来检索一系列成员？

要从Redis的有序集合中根据分数获取成员列表，应使用ZRANGEBYSCORE命令。1）基本语法为ZRANGEBYSCORE key min max，用于获取指定分数范围内的成员；2）可通过添加LIMIT offset count实现分页查询；3）通过在min或max前加(符号可排除边界值；4）添加WITHSCORES标志可同时返回成员及其分数。

If you're working with Redis and need to fetch a list of members from a sorted set based on their scores, ZRANGEBYSCORE is the command you'll want to use. It allows you to specify a minimum and maximum score and returns all members within that range.

Here's how it works and when you might use it.

Basic Usage of ZRANGEBYSCORE

The basic syntax for ZRANGEBYSCORE looks like this:

ZRANGEBYSCORE key min max

• key is the name of your sorted set.
• min and max define the score range you're interested in.

For example, if you have a leaderboard where each user has a score, and you want to get all users with scores between 50 and 100, you’d run:

ZRANGEBYSCORE leaderboard 50 100

This will return all member names whose scores fall into that range — no need to loop through or filter manually.

Adding Limits and Offsets

Sometimes you don’t want every single result at once. That’s where the LIMIT option comes in handy. You can add it like so:

ZRANGEBYSCORE key min max LIMIT offset count

• offset is how many items to skip.
• count is how many items to return.

Let’s say you want the first 10 players scoring between 50 and 100:

ZRANGEBYSCORE leaderboard 50 100 LIMIT 0 10

And if you want the next 10?

ZRANGEBYSCORE leaderboard 50 100 LIMIT 10 10

This is especially useful for pagination or limiting large result sets.

Including or Excluding Boundaries

By default, ZRANGEBYSCORE includes both the min and max values. But what if you want to exclude one or both? You can prefix the value with ( to make it exclusive.

Examples:

• ZRANGEBYSCORE leaderboard (50 100 — scores greater than 50 up to and including 100
• ZRANGEBYSCORE leaderboard 50 (100 — scores up to but not including 100
• ZRANGEBYSCORE leaderboard (50 (100 — scores strictly between 50 and 100

This gives you more precise control over which members are returned.

Getting Members with Their Scores

If you need both the member names and their associated scores, just add the WITHSCORES flag at the end:

ZRANGEBYSCORE leaderboard 50 100 WITHSCORES

This will return an array where each member is followed by their score, like:

1) "user1"
2) "65"
3) "user3"
4) "89"

It’s helpful when you want to display or process the actual scores alongside the members.

That’s how you can retrieve a range of members by their score using ZRANGEBYSCORE. The command is straightforward but powerful once you start combining it with limits, boundaries, and score outputs.

基本上就这些。

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