Using the plugin "RT SQL Layer" is possible to add to qgis a query sql . It call directly posgres without use a memory provider, without save temporary data on datafile and without creating temporary tables. But again qgis need to have a field with unique integers.
I don't sure but perhaps to avoid this needed you can use the "generate_series" to add a sequence number to your query sql. -- ----------------- Andrea Peri . . . . . . . . . qwerty àèìòù -----------------
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