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Recall that the UNION operation effectively combines the rows of two tables, which must have the same number of columns and the compatible data types for each corresponding column. This query, which uses a simple UNION operation:
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SELECT FROM UNION SELECT FROM * GIRLS ALL * BOYS;
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when applied to a five-row table of girls and a five-row table of boys, yields a ten-row table of query results. Each row of query results corresponds precisely to either a row of the GIRLS table or a row of the BOYS table from which it was derived. The query results have two columns, NAME and CITY, because the GIRLS and BOYS tables each have these two columns. The union join of the GIRLS and BOYS tables is specified by this query:
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SELECT * FROM GIRLS UNION JOIN BOYS;
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The query results again have five rows, and again each row of results is contributed by exactly one of the rows in the GIRLS table or the BOYS table. But unlike the simple union, these query results have four columns all of the columns of the first table plus all of the columns of the second table. In this aspect, the union join is like all of the other joins. For each row of query results contributed by the GIRLS table, the columns that come from the GIRLS table receive the corresponding data values; the other columns (those that come from the BOYS table) have NULL values. Similarly, for each row of query results contributed by the BOYS table, the columns that come from the BOYS table receive the corresponding data values; the other columns (this time, those that come from the GIRLS table) have NULL values. 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 NULLextended 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 Steps 2 and 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 The cross join will contain m n rows, consisting of all possible row pairs from the two tables. 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. The left outer join contains all of the rows from the inner join, plus each unmatched row from TBL1, NULL-extended. The right outer join also contains all of the rows from the inner join, plus each unmatched row from TBL2, NULL-extended.
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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, NULLextended. Roughly speaking, its query results are equal to the left outer join plus the right outer join. 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.
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