Keri Systems Doors16 - Manual (Page 157)

Keri Systems, Inc. Doors™ Users Guide
01821-001 October 1998
Revision 2.1 Page 157
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 (TIMEDATE) and the Field Value is set to 07/
04/1997, the report would only include events that occurred on July 4, 1997 (see Figure 144).
Events that occurred on any other date would be excluded from the report.
Figure 144 – 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 (TIMEDATE) 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 145). Events that occurred before July 4, 1997 would be excluded from the report.
Figure 145 – Greater Than or Equal To Criterion Sample