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Are there any types of joins that are comparable to using a UNION operator SQL:2006 actually supports a union join that performs many of the same functions as the UNION operator. The union join is similar to the full outer join, in terms of how query results are consolidated. However, the full outer join allows you to specify (in the ON clause) which columns will be matched, while a union join does not. In addition, the union join has generally not been implemented in SQL relational database management systems (RDBMSs), and it has been deprecated in the SQL:2006 standard, which means that it is a candidate for deletion from future versions of SQL. So for all practical purposes, the union join is not something with which you need to be concerned.
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In addition, the SQL:2006 standard supports the INTERSECT and EXCEPT operators, which have syntax similar to UNION. INTERSECT works like UNION except it returns only rows that appear in the results of both SELECT statements. EXCEPT, on the other hand, returns only rows that appear in the results of the first SELECT statement but not in the results of the second one. SQL Server supports both INTERSECT and EXCEPT. Oracle and MySQL support INTERSECT but use the operator MINUS instead of EXCEPT.
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In this chapter, you have been introduced to a variety of join operations as well as the UNION operator, which, technically, is not considered a join. Now you will have the opportunity to practice several of these join techniques by querying data from the INVENTORY database. Specifically, you will query some of the tables that are configured with foreign key relationships, which are the sort of relationships that tie data from one table to data in another table. Because you will not be changing any data, you should feel free to try out various types of join operations, beyond what we review in this Try This exercise. You can download the Try_This_11.txt file, which contains the SQL statements used in this Try This exercise.
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1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. The first type of operation you ll perform is a comma-separated join on the ARTISTS and
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ARTIST_CDS tables. The join will use the ARTIST_ID column to establish the equi-join condition. Enter and execute the following SQL statement:
SELECT * FROM ARTISTS a, ARTIST_CDS c WHERE a.ARTIST_ID = c.ARTIST_ID;
Your query results should include 19 rows and should include the ARTIST_ID columns from both tables as well as the ARTIST_NAME, PLACE_OF_BIRTH, and COMPACT_ DISC_ID columns.
3. You will now modify the preceding statement so that it also joins the COMPACT_DISCS
table. That way, you can display the actual name of the CDs. In addition, you will specify the names of the columns that should be returned. Enter and execute the following SQL statement:
SELECT FROM WHERE AND d.CD_TITLE, a.ARTIST_NAME, a.PLACE_OF_BIRTH ARTISTS a, ARTIST_CDS c, COMPACT_DISCS d a.ARTIST_ID = c.ARTIST_ID d.COMPACT_DISC_ID = c.COMPACT_DISC_ID;
Your query results should again include 19 rows. However, this time the results will display only the CD_TITLE, ARTIST_NAME, and PLACE_OF_BIRTH columns.
11:
Accessing Multiple Tables
4. Now let s turn the last SELECT statement into a cross join. Enter and execute the following
SQL statement:
SELECT FROM WHERE AND d.CD_TITLE, a.ARTIST_NAME, a.PLACE_OF_BIRTH ARTISTS a CROSS JOIN ARTIST_CDS c CROSS JOIN COMPACT_DISCS d a.ARTIST_ID = c.ARTIST_ID d.COMPACT_DISC_ID = c.COMPACT_DISC_ID;
You should receive the same query results as you did in the preceding SELECT statement.
5. The next type of statement that you ll try is a condition join. As you probably recall,
a condition join can be either an inner join or an outer join. The first type you ll try is the inner join. In this statement, you ll join together three tables: COMPACT_DISCS, COMPACT_DISC_TYPES, and MUSIC_TYPES. Enter and execute the following SQL statement:
SELECT d.CD_TITLE, t.TYPE_NAME FROM COMPACT_DISCS d JOIN COMPACT_DISC_TYPES dt ON d.COMPACT_DISC_ID = dt.COMPACT_DISC_ID JOIN MUSIC_TYPES t ON dt.MUSIC_TYPE_ID = t.TYPE_ID;
Your query results should include 24 rows. Only the CD_TITLE column and the TYPE_ NAME column should be displayed.
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