How to refresh a table results before getting new results ?

Hello,
I receive in a table results from a BI query that is first fed from a selection screen with different dropdowns.
My problem is the following:
- when a new selection is made, the table is updated with new results : OK
- BUT when the result of the query is empty, the table keeps the last results
How can I fix this problem?
Any idea,
Thanks a lot,
Thomas

OK, the model is really simple:
- Form with several selection dropdowns
- BI query
- table with results
Everything is OK but, if there are already results in the table AND the user starts a new search that provides no result (no applicable data), the table is not updated and shows the last results, which is a problem ...
Thanks,
Thomas

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(http://www.oracle.com/technology/products/jdev/howtos/1013/updtable/index.html?_template=/ocom/technology/content/print)
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Hi
Thanks for your infos.
Yes exactly I use almost the same code you have post here.
Could You answer to my next questions?
First - >what do you mean by saying that "it's not good idea using refreshing in IE?" Of course I use refreshing in backing_bean for my button "remove" that removes row, commit changes to database and refresh table, almost the same as You said in your post:
Code in backing_bean is and comments on difference to Your code is below:
public commandButton2_action1(){
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