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The Default Database Diagram
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Although it s not mandatory, I do feel every SQL Server database solution should have a default database diagram built into it so that any developer new or experienced can instantly see how the database being inspected fits together. A default database diagram should include every table and every relationship that is held for that database. Unlike other diagrams that may take a more sectionalized view of things, the default database diagram should be all-encompassing. As mentioned earlier, it is imperative that you keep this diagram up to date. You will notice this statement repeated a few times in this chapter. Don t use the default diagram as the source of development for your database solution. The default diagram includes all the tables, which means that if you re using the database diagram tool for development, you are potentially logically locking out all other users from touching any other table as part of their development, in case their changes are lost. Only update the diagram with tables and relationships once they have been inserted in the database. We ll look at this in more detail later when we discuss the dangers of using the database diagram tool as a source of development. Now that you know what diagrams are and what the tool is, it s time to create the first diagram for this database.
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Try It Out: Creating a Database Diagram
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1. Ensure that SQL Server Management Studio is running and that the ApressFinancial database is expanded so that you see the Database Diagrams and Tables nodes. Select the Database Diagrams node and then right-click. Choose New Database Diagram (see Figure 6-10).
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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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Figure 6-10. Creating a new database diagram 2. If this is the first diagram you are creating for the database, you ll need to install support objects. Without them, you cannot create the diagram, so click Yes at the next dialog prompt (see Figure 6-11).
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Figure 6-11. Installing diagramming support 3. The first screen you ll see when creating the diagram is the Add Table dialog (see Figure 6-12). Select all of the tables listed, as you want to use all the tables in your diagram, and then click Add. This will empty the screen. Click Close.
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Figure 6-12. Selecting tables 4. After a few moments, you will be returned to Management Studio, but with the database diagram now built. The diagram will not show all the tables at this point and will be very large. You can reduce the size through the Size combo box in the diagramming toolbar, as shown in Figure 6-13.
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Figure 6-13. The Size combo box 5. You ll then see a diagram similar to that shown in Figure 6-14. (Don t be surprised if the layout is different, though.)
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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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Figure 6-14. Tables with relationships built so far That s all there is to building a basic diagram.
The Database Diagram Toolbar
Let s next take a look at the toolbar and how each of the buttons works within the diagram. The whole toolbar is shown in Figure 6-15.
Figure 6-15. Database diagram toolbar The first button is the New Table button, as shown in the following image. You click this button to create a new table within the database designer, which is a similar process to that shown in 5. The difference is that you need to use the Properties window for each column rather than having the properties at the bottom of the table designer.
When building the diagram, you selected every table. If you hadn t done so and you wanted to add a table added since you created the diagram, clicking the Add Table button (see the following image) would bring up the Add Table dialog shown earlier to add in any missing tables.
CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
The Add Related Tables button, shown next, adds tables related to the selected table in the designer.
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