exampleData | Some example data for ArangoDB | Database library

If i understand you request correct, you need a OR statement.

Because for most SQL functions (here != is a type of comparison function), when input is NULL, the output is also NULL

I haven’t looked too much into your implementation, however I have a couple of points and suggestions:

• it seems to me that you are using the mod() function inside your objective. The mod() function is discontinuous and the optimizer (especially a gradient-based one like SLSQP) might struggle to find a proper descent direction.
• SLSQP is a local optimization algorithm, it can only guarantee a local minimum. And I seem to remember that Excel uses GRG2, not SLSQP, but this is irrelevant to the question
• you may want to consider the global optimization algorithms in SciPy, and in particular SHGO and DualAnnealing. You should also give NLOpt a try, it implements many good global optimization algorithms (DIRECT, CRS2, etc...).

I've found a nasty trick (not a solution) that may be of help in this specific case. I don't recommend it, but couldn't find any other workaround using flutter_markdown so far, and I couldn't find any other package in substitution neither.

You can take advantage of using triple apostrophes to add vertical space.

It is a nasty workaround, but couldn't find anything better so far to add vertical space.

In classic form, I have solved the issue shortly after almost giving up!

The solution was to bind the object collection to the datagrid within the main window class, then bind the individual properties of country, countries, city and cities. This also included the addition of update triggers for the dependant dropdowns so that an update method in the class could be called.

You can use a custom TableRow for this. I also prefer to use CSS and PseudoClasses to manage the color of rows.

What needs to happen here is that the row needs to know if the checked property in the ExampleData instance currently displayed by the row changes, and needs to change color if that happens.

Of course, for any given table row, the ExampleData instance displayed by that table row may also change (e.g. if the underlying data list changes, or if the user scrolls the table, etc.)

So the basic strategy here is:

1. Create a listener that observes the current item's checked property, and updates the pseudoclass state if it does (which in turn causes the style to change). In the code below I call this listener checkListener.
2. If the item displayed by the row changes, we need to stop observing the old item's checked property and start observing the new item's checked property instead. This can be achieved via a listener on the item property of the table row. That listener on the itemProperty can then remove the checkListener from the checkedProperty of the old item (if there was an old item), and add it to the checkedProperty of the new item (if there is one). It also needs to update the pseudoclass state according to the current state of the new item's checkedProperty.

If you want to group the data, you can reduce the items and concatenate each item to an array that is keyed by the id property.

Provided code is not testable but I think it is because activeTab is not changed because tab views are not identified, due to tag, so try

I think here will be more complex query than just where.

Can you provide SQL query which suits to your problem? I guess you will need to use GROUP BY, COUNT and HAVING (but this is only ma assumption, make it your way ;) )

If I understand your problem right: Join Mobile and Feature tables. Then use where on result