Re : Export Active Category, Sub Category , Item

You could use the query below with PGSQL.

SELECT CategoryDefinition.CATEGORYNAME "Category Name",CategoryDefinition.CATEGORYDESCRIPTION "Category Description" ,SubCategoryDefinition.NAME "Sub Category Name" ,SubCategoryDefinition.DESCRIPTION "Sub Category Description",  ItemDefinition.NAME "Item Name",ItemDefinition.DESCRIPTION "Item Description" FROM CategoryDefinition left join SubCategoryDefinition on  SubCategoryDefinition.CATEGORYID=CategoryDefinition.CATEGORYID  left join ItemDefinition on ItemDefinition.SUBCATEGORYID = SubCategoryDefinition.SUBCATEGORYID where CategoryDefinition.isdeleted='0' or SubCategoryDefinition.isdeleted='0' or ItemDefinition.isdeleted='0' ORDER BY 1,3,5

Regards,

Stephen