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Again the potential for unmatched rows in the joins means there are several possible "right" answers to the query Suppose, as before, that you want to include all girls and boys in the boy/girl pairing, even if the boy or girl does not have a matching row in the PARENTS table You need to use outer joins for the (BOYS join PARENTS) and (GIRLS join PARENTS) parts of the query, but an inner join for the (BOYS join GIRLS) part of the query This SQL2 query yields the desired results: SELECT FROM ON JOIN ON GIRLSNAME, MOTHERSPNAME, BOYSNAME, FATHERSPNAME ((GIRLS LEFT JOIN PARENTS AS MOTHERS ((CHILD = GIRLSNAME) AND (TYPE = "MOTHER"))) ((BOYS LEFT JOIN PARENTS AS FATHERS ((CHILD = BOYSNAME)) AND (TYPE = "FATHER"))).

. . .

Of course, the same features are provided within SQL Server 7 itself When evaluating these special options, be sure to consider their cost and the features that are provided You may find that performance is increased and administration integrates well with the rest of your backup solution Or, you might decide to invest in a whole new backup solution, using SQL Server s utilities to manage database dumps and tape storage In addition to special modules for SQL Server and other databases, many backup software vendors offer other options For example, if you ll be using a tape autoloader, you ll need management software that can handle tape libraries Or, if you need to keep data synchronized between multiple servers, file and directory replication tools are available.

This table has only one column!

- 134 -

Figure 9-7

Each of these special modules will likely cost more in initial software purchases, but they might be worthwhile investments, because they can save time and reduce the chance of errors..

The solution to this problem is to do what an entity-relationship modeler would do: construct what they call an intersect table. In the case of the dimensional model, this will have an amusing side effect: it requires you to maintain a group table with only one column, which is a key value. Figure 9-7 provides an example. The many-to-many relationship between groups and salespeople is resolved by creating an intersect table called group_membership. The sales_group table is left with a single column, the group_key. If you issue the query select * from sales_group, the contents of this table would appear as a sequence of numbers. Although this may seem silly, this configuration should satisfy even the most particular of modeling tools. A primary key can be defined for the group table: sales_group_key. This allows the column to be used as a foreign key in the fact table. TIP If you have a software product that will not allow a many-to-many relationship, you can create an intersect table to resolve it. If the sales_group table in this revised solution seems extraneous, that s because it is. All the information is present in the group_membership table. The sales_group table is completely redundant. In fact, if you look closely, you will see that the group_membership table is identical to the original bridge! The necessity of this absurdity stems from software products that enforce entity-relationship modeling conventions on your dimensional design.

USING (CITY) This query solves the WHERE-clause test problem in a different way by moving the test for the TYPE of parent into the ON clause of the join specification In this position, the test for appropriate TYPE of parent will be performed when the DBMS finds matching columns to construct the join, before the NULL-extended rows are added to the outer join results Because the PARENTS table is being used twice in the FROM clause, in two different roles, it's necessary to give it two different table aliases so that the correct names can be specified in the select list As this example shows, even a four-join query like this one can become quite complex with the SQL2 syntax However, despite the complexity, the SQL2 query does specify precisely the query that the DBMS is to carry out.