HINCRBY key field increment
Increments the number stored at
field in the hash stored at
key does not exist, a new key holding a hash is created. If
field does not exist the value is set to
0 before the operation is performed.
The range of values supported by HINCRBY is limited to 64 bit signed integers.
Integer reply: the value at
field after the increment operation.
increment argument is signed, both increment and decrement operations can be performed:
(integer) 1redis> HINCRBY myhash field 1
(integer) 6redis> HINCRBY myhash field -1
(integer) 5redis> HINCRBY myhash field -10