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A relational database table is essentially a two-dimensional matrix with rows (records) and columns (fields). A primary key is a column that uniquely identifies each row, and that means you can t store the same value in a primary-key column of any two records (so it s also a unique key). The primary key is usually a single numeric or GUID column, but it can also be composed as a set of columns, in which case it s called a composite primary key. Tables can be linked or related to one another using relationships. To set up a relationship, you need foreign keys, which are columns that store primary key values in a host table. For instance, in a one-toone relationship, a record in table A can be associated with a record in table B by A containing a foreign key to B s primary key column, or vice versa, or both, depending on the navigability of the relationship. A one-to-one relationship is rare because it makes more sense to merge the two tables, unless the foreign key is allowed to be null. On the other hand, one-to-many (1..*) relationships are ubiquitous, allowing 440

records in table A to be associated with multiple records in table B. For instance, a Customers table is likely to be associated with an Orders table this way, allowing each customer to have multiple orders. This can be modeled by storing a foreign key in Orders that refers to a Customers primary key. By moving two (or more) foreign keys into a separate association table, you obtain a many-to-many relationship between those tables. Referential integrity refers to the fact that only valid primary key values are allowed in a foreign-key column that is, the rows these keys reference are present in the related table.

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TIP: A number of different LDAP ACLs are configured in Mac OS X 10.6 Server out of the box. When you are configuring the access controls, these may conflict with the ACLs already on your network. In short, it can get very confusing very fast. For more assistance with configuring this type of policy see the book LDAP System Administration from O Reilly Press.

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Table 15-1 shows some of the most common database engines, all of which can be used from F# and .NET. Table 15-1. Common Databases

Now that you have Open Directory set up securely, you might want to start building out the users and groups for your server. Later you can log into client systems using these

Open source database engine Small, embeddable, zeroconfiguration SQL database engine IBM s database engine

accounts, but for now you ll need to set up accounts securely so they can log into the server and access services. You can create users and groups in the LDAP database in Mac OS X Server by using the Workgroup Manager application in /Applications/Server. To create your first user, open Workgroup Manager from the Open Directory master, and select the LDAPv3/127.0.0.1 directory (see Figure 16 14). Then click the New User button in the toolbar, and give the user a name and password.

http://postgresql.org/ www.sqlite.org/

Next, click the Privileges tab (see Figure 16 15), set Login Shell to None (which removes the new user s ability to open Terminal on the server), and uncheck the Allow simultaneous login on managed computers box (which will allow each user to log into only one machine concurrently). Scroll through each additional tab looking for any other settings you feel need to be set. Once you are satisfied with the user settings, click the Save button to create the user account.

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