HDEL key field [field ...]
Removes the specified fields from the hash stored at
key. Specified fields that do not exist within this hash are ignored. If
key does not exist, it is treated as an empty hash and this command returns
Integer reply: the number of fields that were removed from the hash, not including specified but non existing fields.
>= 2.4: Accepts multiple
field arguments. Redis versions older than 2.4 can only remove a field per call.
(integer) 1redis> HDEL myhash field1
(integer) 1redis> HDEL myhash field2
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