# HDEL
**HDEL key field [field ...]**
删除哈希表 `key` 中的一个或多个指定域,不存在的域将被忽略。
Note
在Redis2.4以下的版本里, [HDEL](#hdel) 每次只能删除单个域,如果你需要在一个原子时间内删除多个域,请将命令包含在 [_MULTI_](../transaction/multi.html#multi) / [_EXEC_](../transaction/exec.html#exec) 块内。
**可用版本:**
>= 2.0.0
**时间复杂度:**
O(N), `N` 为要删除的域的数量。
**返回值:**
被成功移除的域的数量,不包括被忽略的域。
```
# 测试数据
redis> HGETALL abbr
1) "a"
2) "apple"
3) "b"
4) "banana"
5) "c"
6) "cat"
7) "d"
8) "dog"
# 删除单个域
redis> HDEL abbr a
(integer) 1
# 删除不存在的域
redis> HDEL abbr not-exists-field
(integer) 0
# 删除多个域
redis> HDEL abbr b c
(integer) 2
redis> HGETALL abbr
1) "d"
2) "dog"
```
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