Redis Sets – SDIFF命令

2020年8月9日18:49:23 评论 69

SDIFF key [key ...]

起始版本：1.0.0

时间复杂度：O(N) where N is the total number of elements in all given sets.

返回一个集合与给定集合的差集的元素.

举例:

key1 = {a,b,c,d}
key2 = {c}
key3 = {a,c,e}
SDIFF key1 key2 key3 = {b,d}

不存在的key认为是空集.

返回值

array-reply:结果集的元素.

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> SDIFF key1 key2
1) "a"
2) "b"
redis>

相关参考链接

Sets相关命令：

命令组	命令
Sets（集合）	SADD; SCARD; SDIFF; SDIFFSTORE; SINTER; SINTERSTORE; SISMEMBER; SMEMBERS; SMOVE; SPOP; SRANDMEMBER; SREM; SSCAN; SUNION; SUNIONSTORE;