Difference between revisions of "SET NULLDISPLAY"

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Line 27: Line 27:
 
INSERT INTO nullon (lastname) VALUES ("Smith")
 
INSERT INTO nullon (lastname) VALUES ("Smith")
 
list off
 
list off
.NULL. Smith
+
.NULL.   Smith
  
 
set nulldisplay to "<null>"
 
set nulldisplay to "<null>"
 
list off
 
list off
<null> Smith
+
<null>   Smith
  
 
set nulldisplay to
 
set nulldisplay to
 
list off
 
list off
.NULL. Smith
+
.NULL.   Smith
 
</code>
 
</code>
  

Revision as of 08:35, 17 April 2009

Class

SQL Applications


Purpose

To specify the text displayed for NULL values


Syntax

SET NULLDISPLAY TO [<expC>]


See Also

ALTER TABLE, CREATE TABLE, EMPTY(), INSERT, ISBLANK(), ISNULL(), SET NULL, SET SQL


Description

The SET NULLDISPLAY command is used to specify the text displayed for NULL values. By default NULL values are displayed as .NULL.. The optional <expC> is used to specify alternative display text. If <expC> is omitted, then the display is reset to the default.


Example

set sql to vfp
set null on
set heading off
CREATE TABLE nullon (firstname c(20), lastname c(20))
INSERT INTO nullon (lastname) VALUES ("Smith")
list off
.NULL.    Smith
 
set nulldisplay to "<null>"
list off
<null>    Smith
 
set nulldisplay to
list off
.NULL.    Smith


Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer