`Execute SQL` in Processing QGIS 2.6

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I made a small model with Processing in QGIS 2.6.

The final layer should be the result of a SQL query. Now, in the Execute SQL dialog window I can add the query:

select name, max(ele) as ele, geomfrom layer_idgroup by id but I haven't understood which name have I to specify in the query (layer_id in the example).

I hope I made myself clear enough.

Thanks



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