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Users Guide Keri Systems, Inc.
7-20 Section 7: Reporting 01914-007 Rev. 5.5
3.2 Boolean Operators
Boolean operators determine how the data being searched will be filtered to locate the data specifically
requested by the report. There are six Boolean operators.
• Equal To (=)
• Greater Than or Equal To (>=)
• Less Than or Equal To (<=)
• Greater Than (>)
• Less Than (<)
• Not Equal To (<>)
Equal To (=)
As a report is being generated, a search expression using the Equal To operator examines each data
string in the event database, searching for data strings that meet the search expression’s Field Type.
If the Field Type is a match, the Field Value in the data string is then compared with the Field Value in
the search expression. If the value in the data string is equal to the value in the expression, the data
string is included in the report; if not, it is excluded from the report.
For example, if the Field Type is set to Date and the Field Value is set to 07/04/1997, the report would
only include events that occurred on July 4, 1997 (see Figure 7-22). Events that occurred on any other
date would be excluded from the report.
Figure 7-22: Equal To Criterion Sample
Greater Than or Equal To (>=)
As a report is being generated, a search expression using the Greater Than or Equal To operator
examines each data string in the event database, searching for data strings that meet the search
expression’s Field Type.
If the Field Type is a match, the Field Value in the data string is then compared with the Field Value in
the search expression. If the value in the data string is greater than or equal to the value in the
expression, the data string is included in the report; if not, it is excluded from the report.
For example, if the Field Type is set to Date and the Field Value is set to 07/04/1997, the report would
only include events that occurred on or after July 4, 1997 (see Figure 7-23). Events that occurred before
July 4, 1997 would be excluded from the report.
Figure 7-23: Greater Than or Equal To Criterion Sample