A decision table consists of two parts
A decision table consists of two parts Condition and result
A decision table is used to represent conditional logic by creating a list of tasks depicting business level rules. Decision tables can be used when there is a consistent number of conditions that must be evaluated and assigned a specific set of actions to be used when the conditions are finally met.
An example of such a sentence (in English) is the following: If it rains, the picnic will be cancelled. ... Languages use a variety of grammatical forms and constructions in conditional sentences. The forms of verbs used in the protasis and apodosis are often subject to particular rules as regards their tense and mood.
A decision tree is a decision support tool that uses a tree-like graph or model of decisions and their possible consequences and Decision tables are a precise yet compact way to model complex rule sets and their corresponding actions.