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HINCRBY key field delta
This command adds
delta to the number that is associated with the given field
field for the hash
key. The numeric value must a 64-bit signed integer.
keydoes not exist, a new hash container is created. If the field
fielddoes not exist in the hash container, the associated string is set to “0”.
keyis not associated with a hash type, or if the string associated with
fieldcannot be converted to an integer, an error is raised.
Returns the value after addition.
$ HSET yugahash f1 5
$ HINCRBY yugahash f1 3
$ HINCRBY yugahash non-existent-f2 4
$ HINCRBY non-existent-yugahash f1 3