SINTERCARD - Upstash Documentation

Use SINTERCARD to get the number of members that the given sets have in common, without building the intersection.

<numkeys> states how many keys follow. LIMIT stops counting once that many common members have been found and returns the limit, which turns an expensive full intersection into a cheap "do these sets share at least N members" test. LIMIT 0 means no limit.

Since nothing is transferred beyond the count, this is much lighter than running SINTER and measuring the reply.

Syntax#

SINTERCARD <numkeys> <key> [<key> ...] [LIMIT <limit>]

Arguments#

Argument	Required	Repeatable	Description
`<numkeys>`	Yes	No	Number of key arguments that follow.
`<key>`	Yes	Yes	Redis key targeted by the command.
`LIMIT <limit>`	No	No	Stop counting once this many members match; `0` means no limit.

Important points#

numkeys must equal the number of key arguments that immediately follow it.

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

SINTERCARD 1 my-key

@upstash/redis

import { Redis } from "@upstash/redis";const redis = Redis.fromEnv();const result = await redis.sintercard(["my-key"]);console.log(result);

upstash_redis

Note

This command is not supported yet in upstash_redis.

ioredis

import Redis from "ioredis";const redis = new Redis(process.env.REDIS_URL!);const result = await redis.sintercard("1", "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.sInterCard(["my-key"]);console.log(result);

redis-py

import osimport redisclient = redis.from_url(os.environ["REDIS_URL"])result = client.sintercard(1, ["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.SInterCard(context.Background(), 0, "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.sintercard("my-key");  System.out.println(result);}

redis-rs

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 mut command = redis::cmd("SINTERCARD");    command.arg("1");    command.arg("my-key");    let result: redis::Value = command.query(&mut connection)?;    println!("{result:?}");    Ok(())}