Learn QGIS - Fourth Edition

Displaying more information using labels

It is possible to build expressions using labels. Using expressions (the button that is right beside the attribute drop-down list and looks like an E), we can format the label text. For example, the NAME field in our sample airports.shp file contains text in uppercase. To display the airport names in mixed case instead, we can set the title(NAME) expression, which will reformat the name text in the title case. We can also use multiple fields to create a label, for example, by combining the name and elevation in brackets using the concatenation operator (||), as follows:

title(NAME) || ' (' || "ELEV" || ')'

Note the use of simple quotation marks around text such as ' (', and double quotation marks around ...