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# SDIFFSTORE

**SDIFFSTORE destination key [key ...]**

這個命令的作用和 [_SDIFF_](sdiff.html#sdiff) 類似，但它將結果保存到 `destination` 集合，而不是簡單地返回結果集。

如果 `destination` 集合已經存在，則將其覆蓋。

`destination` 可以是 `key` 本身。

**可用版本：**

&gt;= 1.0.0

**時間復雜度:**

O(N)， `N` 是所有給定集合的成員數量之和。

**返回值:**

結果集中的元素數量。

```
redis> SMEMBERS joe's_movies
1) "hi, lady"
2) "Fast Five"
3) "2012"

redis> SMEMBERS peter's_movies
1) "bet man"
2) "start war"
3) "2012"

redis> SDIFFSTORE joe_diff_peter joe's_movies peter's_movies
(integer) 2

redis> SMEMBERS joe_diff_peter
1) "hi, lady"
2) "Fast Five"

```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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