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In this Try This exercise, you will use the data modification statements discussed in this chapter to modify data in the INVENTORY database. You will use the INSERT statement to add data, the UPDATE statement to modify data, and the DELETE statement to remove the data from the database. Because you will be working only with data, you will not affect the underlying structure of the tables. You can download the Try_This_08.txt file, which contains the SQL statements used in this exercise.
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1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. First you will add a new company to the CD_LABELS table. The company is DRG
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Records and it will have a LABEL_ID value of 837. Enter and execute the following SQL statement:
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INSERT INTO CD_LABELS VALUES ( 837, 'DRG Records' );
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One row will be added to the CD_LABELS table.
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3. Now let s add a new CD to the COMPACT_DISCS table. The CD is named Ann Hampton
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Callaway, which has a COMPACT_DISC_ID value of 116. There are 14 of these CDs in stock and the LABEL_ID value should be 836. (This is not the correct LABEL_ID value, but we will use it here for the purposes of this exercise.) Enter and execute the following SQL statement:
INSERT INTO COMPACT_DISCS VALUES ( 116, 'Ann Hampton Callaway', 836, 14 );
One row will be added to the COMPACT_DISCS table. The LABEL_ID value of 836 represents Sarabande Records.
4. Now let s insert another row into the COMPACT_DISCS table; only this time, your
INSERT statement will specify the column names of the target table. You will insert a CD named Rhythm Country and Blues. The new row will contain a COMPACT_DISC_ID value of 117, a LABEL_ID value of 832 (MCA Records), and an IN_STOCK value of 21. Enter and execute the following SQL statement:
INSERT INTO COMPACT_DISCS ( COMPACT_DISC_ID, CD_TITLE, LABEL_ID, IN_STOCK) VALUES ( 117, 'Rhythm Country and Blues', 832, 21 );
One row will be inserted into the COMPACT_DISCS table.
8:
Modifying SQL Data
5. After you enter the Rhythm Country and Blues row, you realize that the IN_STOCK value
is incorrect, and you want to update that value to 25. Enter and execute the following SQL statement:
UPDATE COMPACT_DISCS SET IN_STOCK = 25 WHERE COMPACT_DISC_ID = 117;
The IN_STOCK value of the Rhythm Country and Blues row will be changed to 25.
6. You now realize that you entered the wrong LABEL_ID value for the Ann Hampton Callaway
row. However, you want to be able to modify the existing value by specifying the company name rather than the LABEL_ID value. The company name is DRG Records, which you added to the CD_LABELS table in step 2. Enter and execute the following SQL statement:
UPDATE COMPACT_DISCS SET LABEL_ID = ( SELECT LABEL_ID FROM CD_LABELS WHERE COMPANY_NAME = 'DRG Records' ) WHERE COMPACT_DISC_ID = 116;
In this statement, you used a SELECT statement to pull the LABEL_ID value from the CD_LABELS table. The statement returned a value of 837. The value 837 was then used as the LABEL_ID value for the COMPACT_DISCS table. Note that you would not have been able to enter the value of 837 into the LABEL_ID column of the COMPACT_DISCS table if it did not already exist in the CD_LABELS table. Not only is this because a SELECT statement was used to pull that value, but also because the LABEL_ID column in the COMPACT_DISCS table is a foreign key that references the CD_LABELS table. As a result, the value must exist in the referenced table before it can be added to the referencing table. See 4 for more information about foreign keys.
7. Now let s take a look at the data that you ve entered and updated. Enter and execute the
following SQL statement:
SELECT FROM WHERE OR * COMPACT_DISCS COMPACT_DISC_ID = 116 COMPACT_DISC_ID = 117;
The SELECT statement requests data from all columns in the COMPACT_DISCS table, but only for those rows that have a COMPACT_DISC_ID value of 116 or 117. Your query results should include two rows. Verify that the information in those rows is correct. The Ann Hampton Callaway row should have a LABEL_ID value of 837 and an IN_STOCK value of 14, and the Rhythm Country and Blues row should have a LABEL_ID value of 832 and an IN_STOCK value of 25.
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