Edit Expressions dialog
This dialog is used to begin the creation of a SQL expression, or to access an existing SQL expression for editing.
This dialog is opened, for example, when you click the SQL button on the Editor pane of the Layer Theme Editor dialog.
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If expressions are already listed in the dialog, you can double-click one (or select it and click the Edit button) to open a dialog with a SQL building page.
If you want to create a new expression, you can click the Add New button and enter a name into the New Expression dialog. Clicking OK will then open the dialog with the SQL building page.
You can delete an expression by selecting it in the list and clicking Delete.
