UK [del] US [del]

n. Differential operator, inverted triangle

redis DEL command syntax

Function:Delete one or more given keys. Keys that do not exist will be ignored.

Syntax: DEL key [key ...]

Available versions: >= 1.0.0

Time complexity: O(N), N is the number of deleted keys. Deleting a single string type key has a time complexity of O(1). To delete a single list, set, ordered set or hash table type key, the time complexity is O(M), where M is the number of elements in the above data structure.

Return: The number of deleted keys.

redis DEL command example

#  刪除單個 key
redis> SET name huangz
OK
redis> DEL name
(integer) 1
# 刪除一個不存在的 key
redis> EXISTS phone
(integer) 0
redis> DEL phone # 失敗，沒有 key 被刪除
(integer) 0
# 同時刪除多個 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