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I would like to join a CSV and a vector layer, based on a field.

I know I can handle this with multiple lines like in first part of https://www.qgistutorials.com/en/docs/performing_table_joins_pyqgis.html .

However, in order to get things a bit shorter and clearer, I would like to use processing algorithm "qgis:joinattributestable". Under Qgis2, processing.runandload('qgis:joinattributestable', shp, csv, shpField, csvField, None) would be the solution.

Now I'm under Qgis 3.8, I know I can use processing.runandLoad('', parameters).
My question then is : what are the keys of the values (shp, csv, shpField, csvField) that I have to feed parameters dictionnary with ? And also where can I fin this information next time ? (https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectorgeneral.html#join-attributes-by-field-value does not tell it if I'm right).

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I just found the answer...for those who would be interested : I had not thought about processing.algorithmHelp("qgis:joinattributestable").

However, the question about an online database to find all the processing algorithms and their parameters is still up-to-date.

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