I do not understand what language I have to use in field-calculator and labels on QGIS:
SQL or Python?
And where I can find the possible script/expressions to use?
in the image you can see the options for expressions in QGIS 1.8 italian version
Thanks
Answer
QGIS doesn't use SQL or Python (..yet) for it's field calculator. It uses it's own simple expression language. It is modeled off a SQL-like style but is not really any SQL dialect in particular.
All the functions can be found in the expression builder itself:
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