DECRBY key decrement
Decrements the number stored at
decrement. 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.
Integer reply: the value of
key after the decrement
"OK"redis> DECRBY mykey 3