Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

Chapter 8: Being Normal: Normalization and Other Basic Design Issues
From here, you can, as I’m sure you can imagine, create, edit, and delete indexes. You can also establish
which filegroup you want the index to be stored on (in most instances, you’ll just want to leave this
alone). We’ll look further into indexes in our next chapter.
Check Constraints
Moving on to the next menu option (or icon if you’re using the toolbar to get to these dialogs that we’ll
examine here), we can manage check constraints as shown in Figure 8-17.
Again, this one is pretty much grayed out. Why? Well, there aren’t any constraints of any kind other
than a primary key defined for our CustomerNotes table, and that primary key is dealt with on the
Index/Keys tab. This particular dialog is for check constraints only — if you want to see this tab in full
action, then you need to click Add and add a constraint.
Relationships
244
Figure 8-17
Well, we’ve seen what the diagramming tool offers us relative to tables, so, as promised, next up on our
list to review is the relationship line (and the underlying details of that relationship).
Looking at a relationship line, the side with the key is the side that is the “one” side of a relationship.
The side that has the infinity symbol represents your “many” side. The tools have no relationship line
available to specifically represent relationships where zero is possible (it still uses the same line). In
addition, the only relationships that actually show in the diagram are ones that are declared using foreign
key constraints. Any relationship that is enforced via triggers — regardless of the type of relationship —
will not cause a relationship line to appear.
Looking at our AdventureWorks2008 diagram again, and try right-clicking the SalesOrderHeader
table and selecting Relationships. This brings up a more populated version of the Relationship dialog