Updating the following field dropdown class upper
Click a value in the left panel to display the feature’s attributes in the right one.
To select a feature, you need to click inside the square symbol at the left of the identifier. Like in the table view, you can perform multiple feature selection using the keyboard combinations previously exposed.
This currently includes tables supported by OGR and delimited text, as well as the Postgre SQL, MSSQL, Spatia Lite, DB2 and Oracle provider. Whether a layer is spatially enabled or not determines whether you can interact with it on the map.
Non-spatial tables can be browsed and edited using the attribute table view. For example, you can use columns of a non-spatial table to define attribute values, or a range of values that are allowed, to be added to a specific vector layer during digitizing.
Features in the table can be searched, selected, moved or even edited.
QGIS allows you to load spatial and non-spatial layers.
Changing the selection in the main canvas does not move the cursor position in the attribute table.
In form view of the attribute table, features are by default identified in the left panel by the value of their displayed field (see ).
A small arrow indicates the sort order (downward pointing means descending values from the top row down, upward pointing means ascending values from the top row down).
When you click on the field calculator icon the dialog opens (see figure_field_calculator).
If the layer is not in edit mode, a warning is displayed and using the field calculator will cause the layer to be put in edit mode before the calculation is made.
For example, you may want to use a virtual field if you need area to be evaluated as you digitize features or to automatically calculate a duration between dates that may change (e.g., using While Field calculator is always available, the quick field calculation bar on top of the attribute table is only visible if the layer is in edit mode.
Thanks to the expression engine, it offers a quicker access to edit an already existing field.