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Why not using the Virtual layer? As you already have some sql with filtering, make from it virtual layer. You can connect many layers in one and besides that, it will update automatically when you mak …

Move your DWG drawing in correct location and import that dwg to QGIS in correct CRS Projection. …

The content of the column is not geometry in wkt format. The right example string is: POLYGON ((coordinates)). Depending on the size of the file, you can edit it manually, or use, for example, notepad …

You don't mention the QGIS version, but I will assume the newest one. In QGIS 3.6 in Processing you will find Remove duplicates by attribute algorithm. Link to visual change log …

In 3.8 is possible to make html form widget. Link to YouTube movie Basicly you can write fancy html page with animation and so on and add expression or data from layers. Big problem is lack of docu …

Using Geometry Generator in style, you can change line feature to be rendered as polygon. For example added as small buffer, and later on style that buffer as polygon, so add gradient to it.

You can try use Set style for vector layer algorythm. Adventage of that solution is that you can make it batch processing/save that to for later reuse.

Both layers must be the same type. As you can see, one layer is MultiPoligon and second is MultiPoligonZ. I assume this may be the reason.

You lost your symbology because qgis save it as RGB values where they are set accordingly to your symbology in the Layer. And no other way is possible. …

You can find Translate algorythm in Processing. And I think is the best solution.

It is QGIS plugin. You must add raster to QGIS from this plugins toolbar to start working with it and even it's already georeferenced, you can make changes to it. Sample gif: …

As far as I know, QGIS is not multi-thread application in any algorythm. You can only set it in rendering. … You can find some thread in dev list about making qgis multi-thread, but I don't recall anything about it in changelog since version 3.0. …

Go to Display in properties windows. Change Display expression/name (mention in comment's) to desired value.

In the most of the cases, for me at least, is different layer type geometry. For example you marged some of the pipe and in result you make multiline geometry, but the layer you have is line geometry. …

You can use Refactor Fields, as part of your model.