SUNIONSTORE destination key [key ...]
Available since: 1.0.0
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
redis> SADD key1 "a"
TBD
redis> SADD key1 "b"
TBD
redis> SADD key1 "c"
TBD
redis> SADD key2 "c"
TBD
redis> SADD key2 "d"
TBD
redis> SADD key2 "e"
TBD
redis> SUNIONSTORE key key1 key2
TBD
redis> SMEMBERS key