Decrements a number from the integer value of a key. Uses 0 as initial value if the key doesn’t exist.
DECRBY
key
decrement
Decrements the number stored at key
by
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 the key after decrementing it.
O(1)
@fast @string @write
127.0.0.1:6379> SET mykey "10"
OK
127.0.0.1:6379> DECRBY mykey 3
(integer) 7
APPEND, DECR, GET, GETDEL, GETEX, GETRANGE, INCR, INCRBY, INCRBYFLOAT, LCS, MGET, MSET, MSETNX, SET, SETRANGE, STRLEN.