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# RANDOMKEY

**RANDOMKEY**

從當前數據庫中隨機返回(不刪除)一個 `key` 。

**可用版本：**

&gt;= 1.0.0

**時間復雜度：**

O(1)

**返回值：**

當數據庫不為空時，返回一個 `key` 。當數據庫為空時，返回 `nil` 。

```
# 數據庫不為空

redis> MSET fruit "apple" drink "beer" food "cookies"   # 設置多個 key
OK

redis> RANDOMKEY
"fruit"

redis> RANDOMKEY
"food"

redis> KEYS *    # 查看數據庫內所有key，證明 RANDOMKEY 并不刪除 key
1) "food"
2) "drink"
3) "fruit"

# 數據庫為空

redis> FLUSHDB  # 刪除當前數據庫所有 key
OK

redis> RANDOMKEY
(nil)

```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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