DECR
DECR key
Decrements the number stored at key
by one. If the key does not exist, it is set to 0
before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer. This operation is limited to 64 bit signed integers.
See INCR for extra information on increment/decrement operations.
Return value
Integer reply: the value of key
after the decrement
Examples
redis>
SET mykey "10"
"OK"
redis>
DECR mykey
(integer) 9
redis>
SET mykey "234293482390480948029348230948"
"OK"
redis>
DECR mykey
ERR ERR value is not an integer or out of range
© 2009–2020 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
https://redis.io/commands/decr