[drzel]

The copied data will one day get out of sync. And you will have a difficult and urgent issue to solve.

Query complexity on the other hand requires knowledge, to make the query work and again to make it fast. But it won’t be urgent, and having made it work you will be a better developer.

Of course, sometimes we need to copy / cache etc. but avoid it if you can.

[iceporter]

yeah you are right I think I will try to use view, and union

this will make me a better developer!