EXISTS
Syntax
EXISTS key [key ...]
- Available since:
- 1.0.0
- Time complexity:
- O(N) where N is the number of keys to check.
- ACL categories:
-
@keyspace
,@read
,@fast
,
Returns if key
exists.
The user should be aware that if the same existing key is mentioned in the arguments multiple times, it will be counted multiple times. So if somekey
exists, EXISTS somekey somekey
will return 2.
Examples
RESP2/RESP3 Reply
Integer reply: the number of keys that exist from those specified as arguments.History
- Starting with Redis version 3.0.3: Accepts multiple
key
arguments.