Could be the whole. At least a part. When a party is disappointed with a trial judge's ruling, he may under some circumstances appeal the order to a higher court. Many people are confused about this process, however, believing one may take an appeal to the higher court for any reason, e.g., he didn't like the ruling. In fact, appeals are decided exclusively on fixed principles of law, and the appellant's view of right and wrong will almost never have any effect on the appellate court.
Abuse of discretion is one effective basis for a favorable appellate decision.
Abuse of power is another, though much less frequent, basis for an appellate court to overturn the decision of a trial judge. Violation of the rules of evidence is another, as when the appellant was denied due process by the trial court's refusal to allow him to present relevant testimony or where the other party was permitted to present evidence that exceeds what is permitted the rules. In order to appeal effectively, however, you must make an effective record. If you fail to make your record at the trial level, your appeal will be flatly denied. When something happens during the trial court proceedings that is contrary to what is taught by Juris dictionary you must make certain to object in such a way that the court record shows you have objected and why you objected.