• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 19. Advanced SQL > Working with Null Values

Working with Null Values

One of the most confusing concepts in SQL is the idea of a null value. A null value indicates that there is literally nothing recorded in the table for that row and column. For instance, consider the Customers table's CustomerSince column. Obviously, if you know this information, you'll record it here. If you don't, you probably want to leave the column blank; you set it to NULL.


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint