natural language database query

Structured database languages such as SQL can be difficult for novices (and experts!) and so {[natural language interfaces}} may be used to allow a user to say something such as, "give me a list of items that need reordering"", rather than, ""SELECT * from Items, StockLevels WHERE Items.id = StockLevels.item_id AND StockLevels.in_stock < Items.reoder_level".