NVL and no return line
HelloI found a small error in code in a SQL-Construct equivalent to this one:
SELECT NVL (dummy, 'A') where 1 = 2 double
This query will display nothing instead of waiting for 'A', because according to me no rows are returned, and if no NULL value could be replaced.
BUT at least surprising to me,
SELECT NVL)
((SELECT NVL (dummy, 'A') where double-1 = 2), 'B')
of the double
will return 'B '.
What would be a good explanation for this behavior?
I found nothing in the documentation on that.
Pretty strange for me, on the net often other "solutions" are proposed as "
SELECT * from)
SELECT NVL (dummy, 'A') where 1 = 2 double
UNION ALL
SELECT 'A' starting two)
where
rownum = 1
or using EXISTS.
Are there disadvantages of the NVL-simple wrapper?
Concerning
Chris
Edited by: chris227 the 11.01.2010 01:43
What would be a good explanation for this behavior?
Do not know if the explanation is good, but
Now here's a scalar subquery
select nvl(dummy, 'A') from dual where 1 = 2;
Which is evaluated once for each line of external selection. Select external returns a line because it's a selection of the double, without any where condition.
So the internal selection is evaluated only once, finds no trace, so evaluates to NULL.
Concerning
Peter
Tags: Database
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Yes, it is a pain. I filed https://javafx-jira.kenai.com/browse/RT-29082 earlier. Go ahead and vote in favour if you're inclined...
I think that the problem in your case, it is the observable list provided by MultipleSelectionModel.getSelectedItems () is not serializable. So even if you make your player Serializable class, the list is not. The first thing I would try, I think, is to make player implements Serializable and pass in an ArrayList instead of the observable list. If you can do
content.put(dataFormat, new ArrayList
(playersListView.getSelectionModel().getSelectedItems())); and
List
player = (List ) dragEvent.getDragboard().getContent(dataFormat); teamListView.getItems().addAll(player); If it does not, a solution is simply to store the "slipped" into a property list:
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Headphones and speakers play a sound at the same time!
Hello. I had a problem in recent weeks where the sound that plays on my computer, either a film or music or a game, it is both my helmet and my built-in speakers. Can someone help me please?