Defensive Database Programming - Red Gate Software

Chapter 6: Common Problems with Data IntegrityVALUES ('Tent','Camping Gear',20) ;Listing 6-17: Populating Boxes and Items tables with valid test data.Listing 6-18 confirms that the constraint prevents invalid data from saving.INSERT INTO dbo.Items(ItemLabel,BoxLabel,WeightInPounds)VALUES ('Yoga mat','No Such Box',2) ;Msg 547, Level 16, State 0, Line 1The INSERT statement conflicted with the FOREIGN KEYconstraint "FK_Items_Boxes". The conflict occurred indatabase "TEST", table "dbo.Boxes", column 'BoxLabel'.The statement has been terminated.Listing 6-18: FK_Items_Boxes prohibits orphan rows.Disabled constraints do…nothingSay we need to bulk load data into these two tables, and that the loading must completeas quickly as possible; this is a very common requirement. Assuming we know that thedata comes from a trusted source, and that all the data in that source is clean, it is quitea common practice to disable the FOREIGN KEY constraint, so that we can start loading175