# DEL
**DEL key [key ...]**
删除给定的一个或多个 `key` 。
不存在的 `key` 会被忽略。
**可用版本:**
>= 1.0.0
**时间复杂度:**
O(N), `N` 为被删除的 `key` 的数量。删除单个字符串类型的 `key` ,时间复杂度为O(1)。删除单个列表、集合、有序集合或哈希表类型的 `key` ,时间复杂度为O(M), `M` 为以上数据结构内的元素数量。
**返回值:**
被删除 `key` 的数量。
```
# 删除单个 key
redis> SET name huangz
OK
redis> DEL name
(integer) 1
# 删除一个不存在的 key
redis> EXISTS phone
(integer) 0
redis> DEL phone # 失败,没有 key 被删除
(integer) 0
# 同时删除多个 key
redis> SET name "redis"
OK
redis> SET type "key-value store"
OK
redis> SET website "redis.com"
OK
redis> DEL name type website
(integer) 3
```
- Redis 文档
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- 事务(transaction)
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- List(列表)
- BLPOP
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- 关于