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Previous query rewritten as a right outer join with an ON condition.
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SELECT MOVIE_GENRE_DESCRIPTION AS GENRE, MOVIE_TITLE FROM MOVIE RIGHT OUTER JOIN MOVIE_GENRE ON MOVIE.MOVIE_GENRE_CODE = MOVIE_GENRE.MOVIE_GENRE_CODE;
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Previous query rewritten as a full outer join. Since each movie must have a genre code assigned, this will give exactly the same result as the right outer join just shown. However, if the movie genre code were optional, the full outer join would allow you to display genres that had no movie assigned as well as movies that had no genre assigned.
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SELECT MOVIE_GENRE_DESCRIPTION AS GENRE, MOVIE_TITLE FROM MOVIE FULL OUTER JOIN MOVIE_GENRE ON MOVIE.MOVIE_GENRE_CODE = MOVIE_GENRE.MOVIE_GENRE_CODE;
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Listing of movie genre descriptions that have no movies assigned to them. There are other ways to do this, but this query uses the fact that unmatched rows come back as null values to select only genres with no matching movies. Since MOVIE_TITLE will always be null in the result set, there is no reason to select (and display) the column.
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SELECT MOVIE_GENRE_DESCRIPTION AS GENRE FROM MOVIE RIGHT OUTER JOIN MOVIE_GENRE ON MOVIE.MOVIE_GENRE_CODE = MOVIE_GENRE.MOVIE_GENRE_CODE WHERE MOVIE_TITLE IS NULL; GENRE ----------------------------Anime and Animation Children and Family Classics Documentary Horror Independent Music and Musicals Science Fiction and Fantasy Special Interest Sports Thrillers 11 rows selected.
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In answer to market demand from their customers, several relational database vendors introduced outer joins before the standard JOIN clause was agreed upon. The following topics present a few implementations of proprietary outer join syntax. These proprietary solutions are shown here only because you might run across them in legacy SQL. The standard JOIN clause should be used whenever possible because it s portable and easier to understand.
Oracle Outer Join Syntax
Oracle Corporation decided to use a plus sign enclosed by parentheses to de ne outer joins. The symbol (+) is placed in the WHERE clause on the side opposite from the table from which you want all rows returned (whether matched or not). Since the data from the other table (the one where only matching rows are returned) is lled with null values when no matching row is found, it may be easiest to remember that the (+) symbol goes on the side of the WHERE clause where you
SQL Demysti ed
want nulls added when no matching row is found. Here is the previous example rewritten in Oracle s proprietary syntax:
SELECT MOVIE_GENRE_DESCRIPTION AS GENRE FROM MOVIE A, MOVIE_GENRE B WHERE A.MOVIE_GENRE_CODE(+) = B.MOVIE_GENRE_CODE AND MOVIE_TITLE IS NULL;
Microsoft SQL Server Outer Join Syntax
Microsoft SQL Server uses the operator *= in the WHERE condition for a left outer join and =* for a right outer join. In both cases, there cannot be a space between the asterisk and the equal sign. Here is the previous example rewritten in the SQL Server proprietary syntax (as a right outer join):
SELECT MOVIE_GENRE_DESCRIPTION AS GENRE FROM MOVIE A, MOVIE_GENRE B WHERE A.MOVIE_GENRE_CODE =* B.MOVIE_GENRE_CODE AND MOVIE_TITLE IS NULL;
Self Joins
A self join is a join of a table to itself. This will seem very odd at rst, but sometimes there are relationships where the primary key and foreign key are in the same table. These are called recursive relationships, and there is one in the video store database. (You may want to refer back to Figure 1-8 in 1 at this point.) The EMPLOYEE table has a column called SUPERVISOR_PERSON_ID, which is a foreign key to PERSON_ID in the same table. It is used to link each employee to their supervisor, who is, of course, another employee, which means that the supervisor also has a row in the EMPLOYEE table. The following query shows three columns from the EMPLOYEE table, including the PERSON_ID and SUPERVISOR_PERSON_ID:
SELECT PERSON_ID, EMPLOYEE_HOURLY_RATE AS HOURLY_RATE, SUPERVISOR_PERSON_ID FROM EMPLOYEE; PERSON_ID HOURLY_RATE SUPERVISOR_PERSON_ID ---------- ----------- -------------------1 15 2 9.75 1 10 9.75 1
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