SUNIONSTORE

Syntax

SUNIONSTORE destination key [key ...]

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

ACL categories: @write, @set, @slow

This command is equal to SUNION, but instead of returning the resulting set, it is stored in destination.

If destination already exists, it is overwritten.

Return

Integer reply: the number of elements in the resulting set.

Examples

dragonfly> SADD key1 "a"
(integer) 1
dragonfly> SADD key1 "b"
(integer) 1
dragonfly> SADD key1 "c"
(integer) 1
dragonfly> SADD key2 "c"
(integer) 1
dragonfly> SADD key2 "d"
(integer) 1
dragonfly> SADD key2 "e"
(integer) 1
dragonfly> SUNIONSTORE key key1 key2
(integer) 5
dragonfly> SMEMBERS key
1) "a"
2) "c"
3) "b"
4) "d"
5) "e"