Q: Set the filter expression to the layer, BaseMap_R.NAME = “Beijing”. When the dataset corresponding to the layer is in UDB datasource, it can achieve the filtering effect. In the oracle datasource, after you add this filter condition, the entire layer does not show, why?
A: The sql condition in Oracle doesn’t support double quotation marks. For charactertyped fields, please use the 'Beijing' format when determining a field value.
