Redis Sunionstore 命令将给定集合的并集存储在指定的集合 destination 中。如果 destination 已经存在,则将其覆盖。
redis Sunionstore 命令基本语法如下:
redis 127.0.0.1:6379> SUNIONSTORE DESTINATION KEY KEY1..KEYN
>= 1.0.0
结果集中的元素数量。
redis 127.0.0.1:6379> SADD myset1 "hello" (integer) 1 redis 127.0.0.1:6379> SADD myset1 "world" (integer) 1 redis 127.0.0.1:6379> SADD myset1 "bar" (integer) 1 redis 127.0.0.1:6379> SADD myset2 "hello" (integer) 1 redis 127.0.0.1:6379> SADD myset2 "bar" (integer) 1 redis 127.0.0.1:6379> SUNIONSTORE myset myset1 myset2 (integer) 1 redis 127.0.0.1:6379> SMEMBERS myset 1) "bar" 2) "world" 3) "hello" 4) "foo"