Automatically displayed field in Oracle APEX - oracle

I have a master detail form in Oracle APEX. The table has items: ID, NAME, PRICE, VAT, TOTAL_COST. Is there a possible way in Oracle APEX to make some items automatically filled up. For example, when user in form enter PRICE, the VAT and TOTAL_COST field automatically are calculated and displayed. Not after the user submit the form.

Yes, create "Set value" dynamic action(s) on item(s) which is (are) changed.

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Oracle Apex IG Dynamic Cascaded Select List Column displaying ID instead of text after saving

In interactive grid, PayToType is select list column and "Pay To Account" is another Column which load dynamically list depend on "PayToType" selection with the help of function Returning SQL Query.
In "Pay To Account" IG Column set the property Parent Columns is "PayToType" under the Cascading List of Values for dynamically loading the relevant list accordingly.
every things look fine, but "Pay To Account" IG Column shows ID instead of selected item text when data load from the table.
I Think "Pay To Account" dynamic list not invoke once data load from the database.

Not showing List of Values Field in my Oracle Apex form

There is no option of List of Values between Validation And link field. I want to create LOV in Particular column
There won't be any unless you modify item type to one that actually contains list of values, such as
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How to hide or show column in Pentaho report based on condition

How can I show or Hide column based on condition.
For example I have column name employees and there is parameter called $country(drop down list). I want that employee column only show on report when country US or Canada is chosen by user else that column does not show on report. How to add that condition on visible property of column. Is there any other steps as well to attain these results?
Thanks.
let's say if you are using text-field do display employee name,in style tab of text-field there is a property called visible,by default it will be true,click on plus sign of that property and you can right you condition there, like below
=IF([country]="US";"true";"false")

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Updating Value in Core Data

I'm trying to write a simple stock check program, and I have a Table View binded to Core Data. The table has 3 columns: Model, Price and Quantity In Stock.
I have a NSTextField and a NSButton underneath this, so that the user can enter the quantity they wish to buy, and when they click "add to cart", the program should fetch the value in the "quantity in stock" column, in the selected row, and deduct the value entered into the NSTextField, obviously, it would return an error is there isn't enough in stock. At the same time, the whole row, model, price and quantity desired should be added to an "invoice".
My question is this: How would I go about retrieving the value in the quantity field at the selected row, manipulating it, and reinserting it into the table?
Or would I have to edit the Core Data directly? And how would I go about that?
Many thanks,
Michael
I assume the table is, in fact, bound to an NSArrayController instance. The controller's selectedObjects property is what you want.

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