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Definition
A materialized view inherits both properties from tables as well as views. Similar to a regular view it has to have a original table from which it retrieves its data and to which it is connected. Similar to a table it includes real data instead of just the algorithm which calculates the data.
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Visualization in QGIS
Materialized views should be preferred over regular views when it is intended to visualize the data, for example in a GIS, since regular views have to constantly recalculate their data when visualizing it and therefore cause performance problems.
When creating a materialized view which holds geometry data, it is important to create a unique index on the ID column. QGIS requires this unique index to properly display the data.
