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# HKEYS

**HKEYS key**

返回哈希表 `key` 中的所有域。

**可用版本：**

&gt;= 2.0.0

**時間復雜度：**

O(N)， `N` 為哈希表的大小。

**返回值：**

一個包含哈希表中所有域的表。當 `key` 不存在時，返回一個空表。

```
# 哈希表非空

redis> HMSET website google www.google.com yahoo www.yahoo.com
OK

redis> HKEYS website
1) "google"
2) "yahoo"

# 空哈希表/key不存在

redis> EXISTS fake_key
(integer) 0

redis> HKEYS fake_key
(empty list or set)

```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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