Comparison Operators

Used to compare expressions. Syntax result=expression1 comparisonoperator expression2 result=object1Isobject2 result=stringLikepattern Comparison operators have these parts:

Part Description
result Required; any numeric variable.
expression Required; any expression.
comparisonoperator Required; any comparison operator.
object Required; any object name.
string Required; any string expression.
pattern Required; any string expression or range of characters.

Remarks The following table contains a list of the comparison operators and the conditions that determine whether result is True, False, orNull:

Operator True if False if Null if
< ( Less than) expression1 < expression2 expression1 >= expression2 expression1 or expression2 = Null
<= ( Less than or equal to) expression1 <= expression2 expression1 > expression2 expression1 or expression2 = Null
> ( Greater than) expression1 > expression2 expression1 <= expression2 expression1 or expression2 = Null
>= ( Greater than or equal to) expression1 >= expression2 expression1 < expression2 expression1 or expression2 = Null
= ( Equal to) expression1 = expression2 expression1 <> expression2 expression1 or expression2 = Null
<> ( Not equal to) expression1 <> expression2 expression1 = expression2 expression1 or expression2 = Null

Note The Is and Like operators have specific comparison functionality that differs from the operators in the table.

When comparing two expressions, you may not be able to easily determine whether the expressions are being compared as numbers or as strings. The following table shows how the expressions are compared or the result when either expression is not a Variant:

If Then
Both expressions are numeric data types (Byte, Boolean, Integer, Long, Single, Double, Date, Currency, or Decimal) Perform a numeric comparison.
Both expressions are String Perform a string comparison.
One expression is a numeric data type and the other is a Variant that is, or can be, a number Perform a numeric comparison.
One expression is a numeric data type and the other is a string Variant that can't be converted to a number A Type Mismatch error occurs.
One expression is a String and the other is any Variant except a Null Perform a string comparison.
One expression is Empty and the other is a numeric data type Perform a numeric comparison, using 0 as the Empty expression.
One expression is Empty and the other is a String Perform a string comparison, using a zero-length string ("") as the Empty expression.

If expression1 and expression2 are both Variant expressions, their underlying type determines how they are compared. The following table shows how the expressions are compared or the result from the comparison, depending on the underlying type of the Variant:

If Then
Both Variant expressions are numeric Perform a numeric comparison.
Both Variant expressions are strings Perform a string comparison.
One Variant expression is numeric and the other is a string The numeric expression is less than the string expression.
One Variant expression is Empty and the other is numeric Perform a numeric comparison, using 0 as the Empty expression.
One Variant expression is Empty and the other is a string Perform a string comparison, using a zero-length string ("") as the Empty expression.
Both Variant expressions are Empty The expressions are equal.

When a Single is compared to a Double, the Double is rounded to the precision of the Single. If a Currency is compared with a Single or Double, the Single or Double is converted to a Currency. Similarly, when a Decimal is compared with a Single or Double, the Single or Double is converted to a Decimal. For Currency, any fractional value less than .0001 may be lost; for Decimal, any fractional value less than 1E-28 may be lost, or an overflow error can occur. Such fractional value loss may cause two values to compare as equal when they are not.

Example

This example shows various uses of comparison operators, which you use to compare expressions.

Dim MyResult, Var1, Var2
MyResult = (45 < 35)    ' Returns False.
MyResult = (45 = 45)    ' Returns True.
MyResult = (4 <> 3)    ' Returns True.
MyResult = ("5" > "4")    ' Returns True.

Var1 = "5": Var2 = 4    ' Initialize variables.
MyResult = (Var1 > Var2)    ' Returns True.

Var1 = 5: Var2 = Empty
MyResult = (Var1 > Var2)    ' Returns True.

Var1 = 0: Var2 = Empty
MyResult = (Var1 = Var2)    ' Returns True.