Delete From Database - deletes data from Table/List, which are binded with given section. (doesn't remove these data from this section)
1. Data to delete can be stored in section binded to the Table/List from Designer by Lookup
2. or only by Data field in Options bookmark.
If delete from database uses Data field (2) and not the section binding (1), there must be at least one key column in the external (Designer) table/list and it must be included in the table/sheet in the app.
Where you can use action:
Section (type:text) - section name.
List/Table (type:text) - external (Designer) table/list name.
Both parameters are always required.