Redis HINCRBY command is used to increment the number stored at the field in the hash, stored at the key by increment. If the key does not exist, a new key holding a hash is created. If the field does not exist, the value is set to 0 before the operation is performed.
Integer reply, the value at the field after the increment operation.
Following is the basic syntax of Redis HINCRBY command.
redis 127.0.0.1:6379> HINCRBY KEY_NAME FIELD_NAME INCR_BY_NUMBER
redis 127.0.0.1:6379> HSET myhash field1 20 (integer) 1 redis 127.0.0.1:6379> HINCRBY myhash field 1 (integer) 21 redis 127.0.0.1:6379> HINCRBY myhash field -1 (integer) 20