SDIFFSTORE(3valkey)

💖 SDIFFSTORE 💖

okay so bestie, welcome to sdiffstore from the Valkey Command Manual (that's the 3valkey manual, iykyk) — it's the glow-up sibling of SDIFF and it's lowkey iconic 🎀

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✨ NAME ✨

sdiffstore — Stores the difference of multiple sets in a key.

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✨ SYNOPSIS ✨

SDIFFSTORE destination key [key...]

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✨ DESCRIPTION ✨

So basically? This command is equal to SDIFF, but instead of returning the resulting set, it is stored in destination. 💅

And if destination already exists, it is overwritten. Gone. Poof. No take-backs. 🙈

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✨ REPLY ✨

valkey-protocol(7) Integer reply: the number of elements in the resulting set.

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✨ COMPLEXITY ✨

O(N) where N is the total number of elements in all given sets. 🦋

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✨ ACL CATEGORIES ✨

@set @slow @write

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✨ HISTORY ✨

• Available since: 1.0.0

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✨ EXAMPLES ✨

127.0.0.1:6379> SADD key1 "a"
(integer) 1
127.0.0.1:6379> SADD key1 "b"
(integer) 1
127.0.0.1:6379> SADD key1 "c"
(integer) 1
127.0.0.1:6379> SADD key2 "c"
(integer) 1
127.0.0.1:6379> SADD key2 "d"
(integer) 1
127.0.0.1:6379> SADD key2 "e"
(integer) 1
127.0.0.1:6379> SDIFFSTORE key key1 key2
(integer) 2
127.0.0.1:6379> SMEMBERS key
1) "a"
2) "b"

see how "c" ghosted us? it was in both sets so it got cancelled 💀 and what's left is "a" and "b", served fresh into key. slay. 👑

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✨ SEE ALSO ✨

sadd(3valkey), scard(3valkey), sdiff(3valkey), sinter(3valkey), sintercard(3valkey), sinterstore(3valkey), sismember(3valkey), smembers(3valkey), smismember(3valkey), smove(3valkey), spop(3valkey), srandmember(3valkey), srem(3valkey), sscan(3valkey), sunion(3valkey), sunionstore(3valkey)

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and that's the whole page, bestie 🫶 this was version 9.0.0, dated 2025-10-21, straight out of the SDIFFSTORE(3valkey) corner of the universe 🌈 mwah, go set-diff something iconic ⭐🌸