Returns a TRUE value if the first of two expressions
is greater than the second expression.
Syntax
expression { GT | > } expression
|
-
expression
- A constant, field name, variable name, or any combination of
these. The expressions on either side of the GT or > must be of
the same data type, although one might be integer and the other decimal.
Example
This
procedure lists all items that have a negative OnHand quantity
or more than 90% of the OnHand inventory currently
allocated:
r-gt.p
FOR EACH Item NO-LOCK:
IF Item.Allocated > 0 THEN IF (Item.OnHand <= 0) OR
(Item.Allocated / Item.OnHand > .9) THEN
DISPLAY Item.ItemNum Item.ItemName Item.OnHand Item.Allocated.
END.
|
Notes
- By
default, the AVM uses the collation rules you specify to compare
characters and sort records. The collation rules specified with
the Collation Table (-cpcoll) startup parameter
take precedence over a collation specified for any database the
AVM accesses during the session, except when the AVM uses or modifies
pre-existing indexes. If you do not specify a collation with the -cpcoll startup
parameter, the AVM uses the language collation rules defined for
the first database on the command line. If you do not specify a
database on the command line, the AVM uses the collation rules with
the default name "basic" (which might or might
not exist in the convmap.cp file).
- If either of the expressions is the Unknown value (?),
then the result is the Unknown value (?); if both of the
expressions are the Unknown value (?), then the result
is FALSE.
- You can compare character strings with GT. Most character comparisons
are case insensitive in ABL. That is, upper-case and lower-case
characters have the same sort value. However, it is possible to
define fields and variables as case sensitive (although it is not
advised, unless strict ANSI SQL adherence is required). If either expression is
a field or variable defined as case sensitive, the comparison is
case sensitive and "Smith" does not equal "smith".
- Characters are converted to their sort code values for comparison. Using
the default case-sensitive collation table, all uppercase letters
sort before all lowercase letters (for example, a is greater than
Z, but less than b). Note also that in character code uppercase
A is less than [ , \ , ^ , _, and ' , but lowercase
a is greater than these.
- You cannot compare data of different DATE, DATETIME, and DATETIME-TZ
data types to each other using GT. You must first convert different
date and datetime data types to the same data type before doing a
comparison between them.
- You can use GT to compare a LONGCHAR variable to another LONGCHAR
or CHARACTER variable. The variable values are converted to -cpinternal for
comparison and must convert without error, or the AVM raises a run-time
error.
- You cannot use GT to compare one CLOB field to another.
- You can use GT to compare two enums, including both ABL and .NET enums, as long as they
are the same enum type. GT compares the underlying numerical values of the
enumerators.