Condition that checks the value of an Item derived from a select list

I want to conditionally display and hide items in a region based on a select list item.
Some items will display when the select list is at the default (%null%) and others will be displayed when the select list user selects from the select list.
The display is then updated when the "SAVE" button is pressed and the page processed.
How do I test the select list item to be null. The condition looks like this;
Type: PL/SQL Expression
:P1_SELECT is null
I also tried, :P1_SELECT is not null and :P1_SELECT = '%nul%'.
The latter changed the condition to :P1_SELECT = ''
How can I test the valu in P1_SELECT?
tia,
Sam
Message was edited by:
After a long day I saw that I did not write the condition correctly. Mea culpa.
slavanaway

I had the problem wrong.
The issue was a second field that could have a Y or N or null. When I checked it in PL/SQL expression as
:P_YN != 'Y' and :P_SELECT is null
assuming the null condition would resolve as != 'Y' I had to do an explicit check as
(:P_YN != 'Y' or :P_YN is null) and :P_SELECT is null
That fixed it.... I like null and I hate null
Thanks for the reply

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import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JOptionPane;
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You may have working code now, but the code you posted is horrible and I'm going to tell you a much much much better approach for the JDBC part. (You should probably isolate your database code from your user interface code as well, but I'm skipping over that structural problem...)
Do this instead:
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I've also left some important points in comments.
No guarantees that there isn't a dumb typo in there; I didn't actually compile it, much less test it. It's at least close though...

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int,
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C_V_Harris
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