Columns

Each column in a decision table represents a condition or an action.

The columns in a decision table hold the conditions and actions of the rules in the table. The top cell of each column identifies the object of a condition, or the target of an action.

	Grade	Amount of loan	Insurance required	Insurance rate
1	A	<100,000	false
2	A	[100,000; 300,000]	true	0.001

Each row in the table forms a rule. The rule performs the actions in its row when the conditions in the same row are met. For example, the second row in the example states the following rule:

if
   all of the following conditions are true:
      - the loan grade is A
      - the amount of the loan is between 100000 and 300000
then
   set the Insurance required to true
   set the Insurance rate to 0.001

You use operators to express a range of values for a condition. For example, this condition statement uses a range of ages that requires values for <min> and <max>:

if
   the age of the customer is between <min> and <max>

The following decision table expresses this condition for two rules in the Age column. It uses operators and <min> and <max> values to define the age ranges:

	Age
1	[18; 25]
2	[26; 40]