Reference Page: Comparison Rules

Automatic Comparison Rules

Relationship: One-to-One / Rule: Is Value Equal Or Greater

Definitions

Supported data types: String, Number, Date

Comparison of values of different data types always returns False.
Comparison of values of unsupported data types always returns False.

Data type: String

Strings are compared based on total length and encoding of each character.

Two strings are considered equal if they have equal length (same number of characters) AND all characters, compared one by one, were equal.

A string of longer length is always considered greater. Comparison of two strings is performed character by character up to the first character that differs. The string with the greater character in that position is considered greater.

Data type: Number

Numeric values are considered equal if there is no difference (near-zero-difference) between them (matters for floating point numbers with precision loss).

A greater value is considered greater than a smaller one. All negative numbers are less than zero and all positive numbers. Thus, -1 is less than 100; -100 is less than -1.

The floating-point value NaN (not a number) is greater than any other numeric value and is equal to itself.

Data type: Date

Date/time values are compared per component values: Year, Month, Day, Hour, Second.

Two dates are considered equal if there is zero seconds difference between them.

A later date is considered greater than an earlier one. A date with a greater month but lesser year is considered less, and so forth.

Implementation

Public Function isValueEqualOrGreater(ByVal sActualValue, ByVal sExpectedValue, ByVal sFormat)
 Dim intRC
 If Not isSameFormat(sActualValue, sExpectedValue, sFormat) Then
 isValueEqualOrGreater = False
 Exit Function
 End If
 Select Case UCase(sFormat)
 Case "NUMBER"
 If CDbl(sActualValue) >= CDbl(sExpectedValue) Then
 isValueEqualOrGreater = True
 Else
 isValueEqualOrGreater = False
 End If
 Case "DATE" 
 If DateDiff("s", CDate(sActualValue), CDate(sExpectedValue)) <= 0 Then
 isValueEqualOrGreater = True
 Else
 isValueEqualOrGreater = False
 End If
 Case "STRING"
 intRC = StrComp(sActualValue, sExpectedValue)
 If (intRC = 0) OR (intRC = 1) Then
 isValueEqualOrGreater = True
 Else
 isValueEqualOrGreater = False
 End If
 Case Else 
 isValueEqualOrGreater = False
 End Select
End Function

Test Code

 Log.Message("1-1 Comparison: isValueEqualOrGreater")
 boolRC = isValueEqualOrGreater("zzzzaaaa", "aaaazzzz", "String")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater("abc", "ab", "String")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater("abc", "ab ", "String")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater(1, 0, "Number")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater(dblNearlyZero, 0, "Number")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater(0, -1, "Number")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater(-1, -10, "Number")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 sValue1 = CDate("1/1/2002")
 sValue2 = CDate("01/01/01")
 boolRC = isValueEqualOrGreater(sValue1, sValue2, "DATE")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 sValue1 = CDate("1/1/2050")
 sValue2 = CDate("31/12/2050")
 boolRC = isValueEqualOrGreater(sValue1, sValue2, "DATE")
 If boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater(1, 1.0, "Number")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater("1", "1.0", "String")
 If boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 boolRC = isValueEqualOrGreater(1, 1.0, "Double")
 If boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 sValue1 = 1
 sValue2 = 1+dblNearlyZero
 boolRC = isValueEqualOrGreater(sValue1, sValue2, "Number")
 If boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 sValue1 = 1+dblNearlyZero/10
 sValue2 = 1
 boolRC = isValueEqualOrGreater(sValue1, sValue2, "Number")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 sValue1 = CDate("01/01/01")
 sValue2 = CDate("01/01/2001")
 boolRC = isValueEqualOrGreater(sValue1, sValue2, "DATE")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If
 sValue1 = CDate("01/01/01")
 sValue2 = CDate("1/1/2001")
 boolRC = isValueEqualOrGreater(sValue1, sValue2, "DATE")
 If Not boolRC Then
 Log.Error("isValueEqualOrGreater failed")
 End If