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

@integer-reply: the value of key after the decrement

@examples

SET mykey "10"
DECR mykey
SET mykey "234293482390480948029348230948"
DECR mykey