该命令作用类似于SUNION命令,不同的是它并不返回结果集,而是将结果存储在destination集合中.
如果destination 已经存在,则将其覆盖.
返回值
integer-reply:结果集中元素的个数.
举例
redis> SADD key1 "a"
(integer) 1
redis> SADD key1 "b"
(integer) 1
redis> SADD key1 "c"
(integer) 1
redis> SADD key2 "c"
(integer) 1
redis> SADD key2 "d"
(integer) 1
redis> SADD key2 "e"
(integer) 1
redis> SUNIONSTORE key key1 key2
(integer) 5
redis> SMEMBERS key
1) "c"
2) "e"
3) "b"
4) "a"
5) "d"
redis>