variables in qlikview

[sonikajain]

Hi all,

I needed to know at when all instances are the values of variables computed within an application.

When all will a variable  get refreshed.

Each time I open the app?

Each time I make a selection in the app?

Each time I access it using $(var)?

Please guide me on this.

Thanks

[alexandros17]

If you set a value to a variable this value doesn't change until something happens to change it:

if you LET X=1;

$(X) will always be 1 even if you close and reopen the document.

If you want to change value use button for example.

Obviously if you have LET X=Today(); the value of X will be different on different days and will be updated every time you open the documet;

hope it helps

[pover]

Good question if you are looking to optimize an application.

I'm not entirely sure how this works in the background, but at least the variables appear to change every time a selection is made and the variable is called upon in an active object.  Of course, variables can be nested and called upon by other variables.

At least, I hope it works like that.  Otherwise, using a lot of variables would be very inefficient and I have not seen that to be the case.

Tell me if you see differently.

Karl