SDIFFSTORE - Upstash Documentation

Use SDIFFSTORE to compute the difference between sets and store it in another key.

The destination holds the members of the first source set that are absent from all the others. It is overwritten if it already exists, and deleted when the result is empty. The reply is the number of members stored.

Storing rather than returning the result is what you want when the difference is large or is used more than once, since the destination is an ordinary set that can be paged through or fed into further set operations.

Syntax#

SDIFFSTORE <destination> <key> [<key> ...]

Arguments#

Argument	Required	Repeatable	Description
`<destination>`	Yes	No	Redis key used as destination.
`<key>`	Yes	Yes	Redis key targeted by the command.

Response#

The reply reports the result of the operation. Error replies have the same shape in RESP2 and RESP3 and are surfaced as exceptions by the SDKs below.

Protocol	Reply
RESP2	Integer
RESP3	Integer

Note

Client libraries often decode bulk strings, maps, sets, and numeric strings into language-native values. The table describes the Redis wire reply.

Examples#

TCP examples use the TLS REDIS_URL from the Upstash console. REST examples use UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN.

Redis CLI

SDIFFSTORE dest set1 set2

@upstash/redis

import { Redis } from "@upstash/redis";const redis = Redis.fromEnv();await redis.sadd("set1", "a", "b", "c");await redis.sadd("set2", "c", "d", "e");await redis.sdiff("dest", "set1", "set2");console.log(diff); // ["a", "b"]

upstash_redis

from upstash_redis import Redisredis = Redis.from_env()result = redis.sdiffstore("destination-key", "my-key")print(result)

ioredis

import Redis from "ioredis";const redis = new Redis(process.env.REDIS_URL!);const result = await redis.sdiffstore("destination-key", "my-key");console.log(result);

node-redis

import { createClient } from "redis";const client = await createClient({ url: process.env.REDIS_URL })  .on("error", console.error)  .connect();const result = await client.sDiffStore("destination-key", "my-key");console.log(result);

redis-py

import osimport redisclient = redis.from_url(os.environ["REDIS_URL"])result = client.sdiffstore("destination-key", ["my-key"])print(result)

go-redis

package mainimport (    "context"    "fmt"    "os"    "github.com/redis/go-redis/v9")func main() {    opts, err := redis.ParseURL(os.Getenv("REDIS_URL"))    if err != nil {        panic(err)    }    client := redis.NewClient(opts)    result, err := client.SDiffStore(context.Background(), "destination-key", "my-key").Result()    if err != nil {        panic(err)    }    fmt.Println(result)}

jedis

import java.net.URI;import redis.clients.jedis.Jedis;try (Jedis jedis = new Jedis(new URI(System.getenv("REDIS_URL")))) {  Object result = jedis.sdiffstore("destination-key", "my-key");  System.out.println(result);}

redis-rs

use redis::TypedCommands;fn main() -> redis::RedisResult<()> {    let url = std::env::var("REDIS_URL").expect("REDIS_URL is not set");    let client = redis::Client::open(url)?;    let mut connection = client.get_connection()?;    let result = connection.sdiffstore("destination-key", &["my-key"])?;    println!("{result:?}");    Ok(())}