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# SPOP

**SPOP key**

移除并返回集合中的一個隨機元素。

如果只想獲取一個隨機元素，但不想該元素從集合中被移除的話，可以使用 [_SRANDMEMBER_](srandmember.html#srandmember) 命令。

**可用版本：**

&gt;= 1.0.0

**時間復雜度:**

O(1)

**返回值:**

被移除的隨機元素。當 `key` 不存在或 `key` 是空集時，返回 `nil` 。

```
redis> SMEMBERS db
1) "MySQL"
2) "MongoDB"
3) "Redis"

redis> SPOP db
"Redis"

redis> SMEMBERS db
1) "MySQL"
2) "MongoDB"

redis> SPOP db
"MySQL"

redis> SMEMBERS db
1) "MongoDB"

```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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