The Filter Builder automatically determines which fields are available. By default, the list contains names of the fields in the status table of the alerts database. There are situations where this list is different and these special cases are discussed later. Selecting the Operator Click on the Operator options button to display the comparison operation to be used for the condition element. The range of comparisons available is determined by the field selected on the Column options button.
Some comparisons are unavailable for certain fields.
For example, it is not possible to have a LIKE operation on a numeric field such as Severity . The Value field is sensitive to the type of data required. These types are described in the following sections. String Value Fields String values are displayed as text fields. For example, Figure 3- 2 shows the element inspector for the Agent field.