[Qgis-user] SQL Expressions

[Junior Delaz]

thanks to all of u. Now I uderstand more what I use to write.

2015-03-30 14:31 GMT+02:00 Alexandre Neto <senhor.neto at gmail.com>:

> Someone corrects me If I'm wrong.
>
> On Mon, Mar 30, 2015 at 1:07 PM, Junior Delaz <delazj at gmail.com> wrote:
>>
>> By the way, can someone explain me why for some functions (attribute,
>> getFeature), you need to use simple quote for the fields and double
>> quotes when using other functions ?
>>
>
> Because in the expression calculator, whenever you use the double quotes,
> it will be evaluated before and it will return the value stored inside the
> feature's attribute. But for some functions, like attribute(), one of the
> arguments is a string with the name of the attribute itself, and not his
> value.
>
> Best regards,
>
> Alexandre Neto
>
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