Quiz - QGIS Expressions Masterclass

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This is a short quiz to test your understanding of QGIS Expressions.

- Each question carries 2 points.
- You will see the results immediately after submitting the quiz.

What does the expression "NAME" = 'SELECTED' mean? *

2 points

Compare the value of the NAME attribute with the text SELECTED

Compare the text NAME with the value of the attribute SELECTED

Assign the value SELECTED to the column NAME

Rename the column NAME to SELECTED

Select the correct expression to extract all non-null values from the column NAME *

2 points

"NAME" != NULL

"NAME" || NULL

"NAME" IS NOT NULL

"NAME" <> ''

The function maximum() calculates the maximum value from a field. Select the correct expression to select the feature having the highest value for the field "COUNT" *

2 points

"COUNT" = maximum()

maximum("COUNT")

maximum("COUNT") < "COUNT"

maximum("COUNT") = "COUNT"

You have a vector layer with a field named "start_date" with date values stored as strings of the format '01/01/2021'. How will you convert it to a field of type "Date"?

2 points

to_date('01/01/2021', 'dd/MM/yyyy')

to_date("start_date", 'dd/MM/yyyy')

to_date("start_date")

to_date('01/01/2021')

Clear selection

The function randf() generates a random floating point number between the specified range. The function signature is as follows, where [] marks optional parameters.

randf([min:=0.0][,max:=1.0][,seed:=NULL])

Select all the valid expressions from the list below

2 points

randf()

randf(0, 100)

randf(max:=100)

randf(min:=0, max:=100)

Required

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