barcode generator in vb.net codeproject In this step, you will update the row in the COMPACT_DISC_TYPES table that matches in Software

Generation Code-39 in Software In this step, you will update the row in the COMPACT_DISC_TYPES table that matches

9. In this step, you will update the row in the COMPACT_DISC_TYPES table that matches
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the COMPACT_DISC_ID for the Kojiki CD with the MUSIC_TYPE_ID value for the
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New Age music type. You ll change the music type from New Age to Classical. Enter and execute the following SQL statement:
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UPDATE COMPACT_DISC_TYPES SET MUSIC_TYPE_ID = ( SELECT TYPE_ID FROM MUSIC_TYPES WHERE TYPE_NAME = 'Classical' ) WHERE COMPACT_DISC_ID = ( SELECT COMPACT_DISC_ID FROM COMPACT_DISCS WHERE CD_TITLE = 'Kojiki' ) AND MUSIC_TYPE_ID = ( SELECT TYPE_ID FROM MUSIC_TYPES WHERE TYPE_NAME = 'New Age' );
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The statement uses a subquery in the SET clause to pull the TYPE_ID value from the MUSIC_TYPES table. The statement also uses two subqueries in the WHERE clause of the UPDATE statement to determine which row to update in the COMPACT_DISC_TYPES table. The first subquery in the WHERE clause returns the COMPACT_DISC_ID value for the Kojiki CD. The second subquery returns the TYPE_ID value for the Classical music type.
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10. Now let s query the COMPACT_DISC_TYPES table to view the changes. Enter and
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execute the following SQL statement:
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SELECT FROM WHERE AND AND CD_TITLE, TYPE_NAME COMPACT_DISCS d, COMPACT_DISC_TYPES t, MUSIC_TYPES d.COMPACT_DISC_ID = t.COMPACT_DISC_ID t.MUSIC_TYPE_ID = m.TYPE_ID CD_TITLE = 'Kojiki'; m
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The TYPE_NAME value should now be Classical.
11. Finally, you will return the COMPACT_DISC_TYPES table to its original state. Enter and
execute the following SQL statement:
UPDATE COMPACT_DISC_TYPES SET MUSIC_TYPE_ID = ( SELECT TYPE_ID FROM MUSIC_TYPES WHERE TYPE_NAME = 'New Age' ) WHERE COMPACT_DISC_ID = ( SELECT COMPACT_DISC_ID FROM COMPACT_DISCS WHERE CD_TITLE = 'Kojiki' ) AND MUSIC_TYPE_ID = ( SELECT TYPE_ID FROM MUSIC_TYPES WHERE TYPE_NAME = 'Classical' );
12:
Using Subqueries to Access and Modify Data
This statement is similar to the preceding UPDATE statement that you used, only now the New Age music type will be used (which was the original music type).
12. Let s check the table one more time. Enter and execute the following SQL statement: SELECT FROM WHERE AND AND CD_TITLE, TYPE_NAME COMPACT_DISCS d, COMPACT_DISC_TYPES t, MUSIC_TYPES d.COMPACT_DISC_ID = t.COMPACT_DISC_ID t.MUSIC_TYPE_ID = m.TYPE_ID CD_TITLE = 'Kojiki'; m
The COMPACT_DISC_TYPES table should now contain the same values as it did when you started this exercise.
13. Close the client application.
Try This Summary
In this Try This exercise, you created several SELECT statements that contained subqueries. These subqueries were included in predicates that permit the subqueries to return one or more rows. Specifically, the WHERE clauses included the IN, EXISTS, and ANY predicates. In addition, you created a SELECT statement that included a comparison predicate, which permits the subquery to return only one row. You also created a SELECT statement that included nested subqueries. These subqueries used the IN predicate. In addition to querying data in the INVENTORY database, you updated the COMPACT_DISC_TYPES table by using subqueries that accessed other tables. As you can see, subqueries provide you with a versatile tool for accessing data in your database. However, when creating statements that include subqueries, you should always try to determine whether a join would perform better in any given situation.
12 Self Test
1. In which types of statements can you include subqueries A SELECT B INSERT C UPDATE D DELETE 2. What is a subquery
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3. In which clauses of a SELECT statement can you include a subquery A SELECT B WHERE C GROUP BY D HAVING 4. Into what two general categories can you divide subqueries in a WHERE clause 5. Which types of predicates are you prevented from using with subqueries that return
multiple rows
A IN and EXISTS predicates B SOME, ANY, and ALL predicates C Comparison predicates D Quantified comparison predicates 6. When does an EXISTS condition evaluate to true 7. What should be included in a subquery s search condition when using an EXISTS
predicate
8. In addition to numbers, ____________ data can be compared in comparison predicates. 9. What are the three quantified comparison predicates 10. Which types of predicates allow you to use subqueries that return multiple rows A IN and EXISTS predicates B SOME, ANY, and ALL predicates C Comparison predicates D Quantified comparison predicates 11. What is a correlated subquery 12. How often is a correlated subquery evaluated when a SELECT statement is processed 13. A(n) ____________ is a subquery that is a component of another subquery. 14. How many subqueries can be included in a SELECT statement, as specified by the SQL
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