Applied Biosystems 7900HT User Manual page 329

Logical Operators
(IF, AND, OR)
Column
Categories
Condition
Operators
Value 1 and 2
Criteria
Applied Biosystems 7900HT Fast Real-Time PCR System and SDS Enterprise Database User Guide
Every statement begins with one of three logical operators: IF, OR, or AND. The
logical operator determines the relationship between the statements in the Add Files
dialog box.
Logical IF Statements
By default, the first statement in the table is always an IF statement. If a plate
document meets the criteria defined by the statement, it is displayed within the Add
Files dialog box.
Logical AND Statements
A logical AND statement evaluates the data set for two expressions: the expression
defined by the AND statement, and the expression defined by the statement in the
previous table row. When an AND statement is used in a filter table, the software
displays a plate document if it evaluates true for both expressions.
Logical OR Statements
Similar to the logical AND statement, a logical OR statement also evaluates the data set
for two expressions (both the previous and current table rows). When an OR statement
is used in a Filter table, the software displays a plate document if it evaluates true for
either expression (or both).
Multiple AND and OR Statements
If dealing with a very large data set, you may want to further refine the number of
plate documents retrieved in a search by creating multiple filter statements. When
creating multiple statements, remember to create and apply them one at a time to
ensure that they function as expected. Also, remember that the software applies each
filter in the order listed in the Add Files dialog box.
Each statement evaluates plate documents based on the values of specific plate
document attributes.
The Condition operator establishes the relationship between the Column category
and the Value 1 and Value 2 criteria by defining the action of the evaluation. The
following list summarizes the possible conditional operators and their corresponding
actions.
• > : Greater than Value 1
• >= : Greater than or equal to Value 1
• < : Less than Value 1
• <= : Less than or equal to Value 1
• equals : Equal to Value 1
• < > : Does not equal Value 1
• between : Is greater than Value 1 but less than Value 2
• contains : Contains the alphanumeric string found in Value 1
The Value 1 and Value 2 criteria define the condition(s) for the evaluation.
DRAFT
September 1, 2004 11:39 am, App_SWReference.fm
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