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Another way of looking at the results of the union join is to compare them to the results of a full outer join of the GIRLS and BOYS tables The union join results include the NULL-extended rows of data from the GIRLS table and the NULL-extended rows of data from the BOYS table, but they do not include any of the rows generated by matching columns Referring back to the definition of an outer join in Figure 7-14, the union join is produced by omitting Step 1 and following Step 2 and Step 3 Finally, it s useful to examine the relationships between the sets of rows produced by the cross join, the various types of outer joins, and the inner join shown in Figure 7-14.

When joining two tables, TBL1 with m rows and TBL2 with n rows, the figure shows that: I The cross join will contain m n rows, consisting of all possible row pairs from the two tables I TBL1 INNER JOIN TBL2 will contain some number of rows, r, which is less than m n The inner join is strictly a subset of the cross join It is formed by eliminating those rows from the cross join that do not satisfy the matching condition for the inner join I The left outer join contains all of the rows from the inner join, plus each unmatched row from TBL1, NULL-extended I The right outer join also contains all of the rows from the inner join, plus each unmatched row from TBL2, NULL-extended..

Figure 7-14.

SELECT C.PERSON_FAMILY_NAME AS EMPLOYEE_NAME, D.PERSON_FAMILY_NAME AS SUPERVISOR_NAME FROM EMPLOYEE A JOIN EMPLOYEE B ON (A.SUPERVISOR_PERSON_ID = B.PERSON_ID) JOIN PERSON C ON (A.PERSON_ID = C.PERSON_ID) JOIN PERSON D ON (B.PERSON_ID = D.PERSON_ID);

I The full outer join contains all of the rows from the inner join, plus each unmatched row from TBL1, NULL-extended, plus each unmatched row from TBL2, NULL-extended. Roughly speaking, its query results are equal to the left outer join plus the right outer join. I The union join contains all of the rows of TBL1, NULL-extended, plus all of the rows of TBL2, NULL-extended. Roughly speaking, its query results are the full outer join minus the inner join.

An important advantage of the SQL2 notation is that it allows very clear specification of three-table or four-table joins. To build these more complex joins, any of the join expressions shown in Figure 7-13 and described in the preceding sections can be enclosed in parentheses. The resulting join expression can itself be used in another join expression, as if it were a simple table. Just as SQL allows you to combine mathematical

7:

Multitable Queries (Joins)

JOIN MOVIE_RENTAL USING (MOVIE_ID, COPY_NUMBER) GROUP BY MEDIA_FORMAT;

operations (+, , *, and /) with parentheses and build more complex expressions, the SQL2 standard allows you to build more complex join expressions in the same way. To illustrate multitable joins, assume that a new PARENTS table has been added to the database containing the GIRLS and BOYS example we have been using. The PARENTS table has three columns: CHILD TYPE PNAME Matches the NAME column in the GIRLS or BOYS table Specifies FATHER or MOTHER First name of the parent

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A row in the GIRLS or BOYS table can have two matching rows in the PARENTS table, one specifying a MOTHER and one a FATHER, or it can have only one of these rows, or it can have no matching rows if no data on the child s parents is available. The GIRLS, BOYS, and PARENTS tables together provide a rich set of data for some multitable join examples. For example, suppose you wanted to make a list of all of the girls, along with the names of their mothers and the names of the boys who live in the same city. Here is one query that produces the list:

SELECT FROM ON JOIN ON WHERE GIRLS.NAME, PNAME, BOYS.NAME ((GIRLS JOIN PARENTS PARENT.CHILD = NAME) BOYS (GIRLS.CITY = BOYS.CITY)) TYPE = "MOTHER"

Because both of these joins are inner joins, any girl who does not have a boy living in the same city or any girl who does not have a mother in the database will not show up in the query results. This may or may not be the desired result. To include those girls without a matching mother in the database, you would change the join between the GIRLS and the PARENTS table to a left outer join, like this:

SELECT MEDIA_FORMAT, COUNT(*) FROM MOVIE_COPY A JOIN MOVIE_RENTAL B ON A.MOVIE_ID = B.MOVIE_ID AND A.COPY_NUMBER = B.COPY_NUMBER GROUP BY MEDIA_FORMAT;