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Sets field in the hash stored at key to value, only if field does not yet exist. If key does not exist, a new key holding a hash is created. If field already exists, this operation has no effect.


@integer-reply, specifically:

  • 1 if field is a new field in the hash and value was set.
  • 0 if field already exists in the hash and no operation was performed.


HSETNX myhash field "Hello"
HSETNX myhash field "World"
HGET myhash field
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