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SQL can combine data from three or more tables using the same basic techniques used for two-table queries. Here is a simple example of a three-table join: List orders over $25,000, including the name of the salesperson who took the order and the name of the customer who placed it. SELECT ORDER_NUM, AMOUNT, COMPANY, NAME FROM ORDERS, CUSTOMERS, SALESREPS WHERE CUST = CUST_NUM AND REP = EMPL_NUM AND AMOUNT > 25000.00 ORDER_NUM ---------112987 113069 113045 112961 AMOUNT COMPANY NAME ---------- --------------- ------------$27,500.00 Acme Mfg. Bill Adams $31,350.00 Chen Associates Nancy Angelli $45,000.00 Zetacorp Larry Fitch $31,500.00 J.P. Sinclair Sam Clark

In 3, it was noted that the existence of an enterprise data warehouse for the storage of atomic data allows dimensional designers to loosen the requirement that fact table grain be set at the lowest level possible That chapter also noted that when a data mart summarizes the base data, the organization may one day regret the decision When a departmental user asks a question that is not answered by summary data, new fact tables will be required Similar considerations apply to the concept of conformance across data marts Because the data mart is defined as a database that organizes analytic data for departmental use, the requirement to conform across data marts may be relaxed Each department can maintain its own view of information If these views become incompatible, however, the veracity of data warehouse information may be called into question.

As we saw earlier in this section, the Database Maintenance Plan Wizard is a good solution for covering most of your backup requirements. It can handle issues related to backing up databases, performing consistency checks, and managing the transaction logs. It also allows you to easily schedule jobs to occur. So why use anything else The main reason to customize backup jobs is for the control and flexibility you will gain. Various scenarios require file and filegroup backups to one or more devices. We also looked at how files and filegroups can be specified through database creation and modification scripts. In this section, we ll look at the commands and operations necessary to perform the types of database backups discussed.

This danger is mitigated by the fact that all data marts are derived from the same source: the enterprise data warehouse The development of incompatible views of data will necessitate development of a new data mart if it becomes necessary to compare the processes For example, if inventory and sales data marts are built for warehouse managers and sales managers, respectively, these data marts may not support the comparison of inventory levels to sales activity This may occur if inventory is sampled weekly and sales is sampled monthly This incompatibility may drive the development of a third data mart, strictly for comparison of these processes In order to avoid these unpleasant consequences, the Corporate Information Factory can benefit from the same kind of dimensional conformance planning that serves the dimensional data warehouse Dimensions of interest across the enterprise can be planned once and mapped to the enterprise data warehouse.

This query uses two foreign keys in the ORDERS table, as shown in Figure 7-5. The CUST column is a foreign key for the CUSTOMERS table, linking each order to the customer who placed it. The REP column is a foreign key for the SALESREPS table, linking each order to the salesperson who took it. Informally speaking, the query links each order to its associated customer and salesperson.

When managing backup security permissions, systems and database administrators normally take the most utilitarian view that is, giving full permissions to those who need to perform backups. In various database products (including previous versions of SQL Server), managing these permissions was quite difficult. In SQL Server 7, however, Microsoft has included several built-in security roles for easing the administration of security. (We covered these in detail in 4.) By default, the system administrator (the SA login) has the permissions to perform any operations on the database. All members of the Windows NT Administrators group are automatically mapped to this login, as well. Although you can assign logins to roles at the server level, it is more likely that you ll want to give specific operators permissions on existing databases. To perform backups of a database, users must have db_owner or db_backupoperator permissions on the database. Once the appropriate permissions have been assigned, you can move on to the actual steps required for performing backups.

This process is significantly simpler, since the integration of disparate data sources has been performed during the design of the enterprise data warehouse itself TIP In a Corporate Information Factory, conformed dimensions are crucial within data marts Planning conformance across data marts is not required, although it can eliminate the need for additional development to support cross-functional analysis..