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Click OK. That’s it. You have created the t_albums table using Enterprise Manager. Listing 4-1 shows the T-SQL script you could execute to create the t_albums table and its associated constraints. F 11/7/01 9:01 AM Page 37 Session 4—Building a Database 37 [band_id] ) GO Everything here should look familiar. These commands are very similar to those used to create the t_bands table. The only difference is the last command that creates the foreign key to the band_id column in the t_bands table. That’s it for tables.
The best approach for this situation is to further normalize your database by creating two new tables. The first is a table to store all albums (for example, t_albums) and a second that stores all band members (for example, t_band_members). The tables t_albums and t_band_members will have foreign keys to the t_bands table. Figure 3-3 shows the new database diagram. F 11/7/01 9:01 AM Page 26 26 Friday Evening You could certainly modify your table design further. But at some point you need to start considering performance.
So what if you only want to return just a few rows based on certain criteria? Well, you would use a WHERE clause. To demonstrate this, execute the following INSERT statements: INSERT INTO t_band_members VALUES (‘Darius’,’Rucker’,1) INSERT INTO t_band_members VALUES (‘Mark’,’Bryan’,1) INSERT INTO t_band_members VALUES (‘Dean’,’Felber’,1) INSERT INTO t_band_members VALUES (‘Jim’,’Sonefeld’,1) (band_member_fname, band_member_lname, band_id) (band_member_fname, band_member_lname, band_id) (band_member_fname, band_member_lname, band_id) (band_member_fname, band_member_lname, band_id) Now you can execute a command to return all the members of Hootie & The Blowfish as follows: SELECT * FROM t_band_members WHERE band_id = 1 Generally, using * is not good practice because it returns all the columns in a table, which is not generally the desired result.
Alien Digest 3 by Creston