I have a Dataset (10Gb) that I imported to QGIS 3.22.
It contains multiple tables and maps.
The first map categorizes land usage (HWRM_HWRK_LN) and I was able to attribute a color gradient.
The four remaining maps represent flooding depth depending on probability. Ut_hq010, for example, represents the depth for a flood level occurring statistically every 10 years; ut_hq050 every 50 years and so on.
These maps only have one Feature count as opposed to the first map wich counts thousands.
Each of these four flood depth maps comes with four tables containing various attributes and information.
My problem is that I don't know how to join tables attributes to the maps in order to show these flooding depth.
Keep in mind that all attribute tables are not editable.
Edit: Fixed the download link.