Redis

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 value is not an integer or out of range
redis> 
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