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You should receive a message indicating that the table was successfully created.
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3. Now you will create an insert trigger on the ARTISTS table. The trigger definition will
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include a REFERENCING clause that specifies a correlation name (New) for the new row that is inserted into the ARTISTS table. That correlation name will then be used in the triggered SQL statement as a value inserted into the ARTIST_LOG table. Enter and execute the following SQL statement:
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CREATE TRIGGER INSERT_LOG AFTER INSERT ON ARTISTS REFERENCING NEW ROW AS New FOR EACH ROW BEGIN ATOMIC INSERT INTO ARTIST_LOG ( ACTION_TYPE, ARTIST_ID ) VALUES ( 'INSERT', New.ARTIST_ID ); END;
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You should receive a message indicating that the trigger was successfully created.
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4. Next you will create an update trigger. This trigger definition is similar to the one in step 3,
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except that you are specifying that it is an update trigger. Enter and execute the following SQL statement:
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CREATE TRIGGER UPDATE_LOG AFTER UPDATE ON ARTISTS REFERENCING NEW ROW AS New FOR EACH ROW BEGIN ATOMIC
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SQL: A Beginner s Guide
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INSERT INTO ARTIST_LOG ( ACTION_TYPE, ARTIST_ID ) VALUES ( 'UPDATE', New.ARTIST_ID ); END;
You should receive a message indicating that the trigger was successfully created.
5. Now you will create a delete trigger. This trigger definition is a little different than the last
two triggers because the REFERENCING clause specifies a correlation name for the old values, rather than the new. This is because new values are not created when you delete data from a table. The correlation name (Old) is then used in the VALUES clause of the INSERT statement. Enter and execute the following SQL statement:
CREATE TRIGGER DELETE_LOG AFTER DELETE ON ARTISTS REFERENCING OLD ROW AS Old FOR EACH ROW BEGIN ATOMIC INSERT INTO ARTIST_LOG ( ACTION_TYPE, ARTIST_ID ) VALUES ( 'DELETE', Old.ARTIST_ID ); END;
You should receive a message indicating that the trigger was successfully created.
6. Now you can begin to test the triggers that you created. The first step is to insert data into
the ARTISTS table. In this statement, values are specified for the ARTIST_ID column and the ARTIST_NAME column, but not the PLACE_OF_BIRTH column. As a result, the default value of Unknown will be inserted in that column. Enter and execute the following SQL statement:
INSERT INTO ARTISTS ( ARTIST_ID, ARTIST_NAME ) VALUES ( 2019, 'John Lee Hooker' );
You should receive a message indicating that the row was successfully inserted into the ARTISTS table.
7. Now you will update the row that you just inserted by providing a value for the PLACE_
OF_BIRTH column. Enter and execute the following SQL statement:
UPDATE ARTISTS SET PLACE_OF_BIRTH = 'Clarksdale, Mississippi, USA' WHERE ARTIST_ID = 2019;
You should receive a message indicating that the row was successfully updated into the ARTISTS table.
8. Your next step is to delete the row that you just created. Enter and execute the following
SQL statement:
DELETE ARTISTS WHERE ARTIST_ID = 2019;
14:
Creating SQL Triggers
You should receive a message indicating that the row was successfully deleted from the ARTISTS table.
9. Now that you ve modified data in the ARTISTS table, you will look at the ARTIST_LOG
table to verify that rows have been entered into the table to record your data modifications of the ARTISTS table. Enter and execute the following SQL statement:
SELECT * FROM ARTIST_LOG;
Your query results should include three rows, one for each action type (INSERT, UPDATE, and DELETE). The rows should all have the same ARTIST_ID value (2019) and include the current dates and times.
10. Your next step will be to drop the triggers from the database. The first trigger that you ll
drop is the insert trigger. Enter and execute the following SQL statement:
DROP TRIGGER INSERT_LOG;
You should receive a message indicating that the trigger was successfully dropped from your database.
11. Next you will drop the update trigger. Enter and execute the following SQL statement: DROP TRIGGER UPDATE_LOG;
You should receive a message indicating that the trigger was successfully dropped from the database.
12. Now drop the delete trigger. Enter and execute the following SQL statement: DROP TRIGGER DELETE_LOG;
You should receive a message indicating that the trigger was successfully dropped from the database.
13. Finally, you will drop the ARTIST_LOG table that you created in step 2. Enter and execute
the following SQL statement:
DROP TABLE ARTIST_LOG;
You should receive a message indicating that the table was successfully dropped from the database.
14. Close the client application.
Try This Summary
In this Try This exercise, you created the ARTIST_LOG table, which was set up to store information about data modifications to the ARTISTS table. Next you created three triggers on the ARTISTS table an insert trigger, an update trigger, and a delete trigger. All three triggers used REFERENCING clauses to allow you to pass the ARTIST_ID value of the modified
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SQL: A Beginner s Guide
row to the ARTIST_LOG table. After the triggers were created, you inserted, updated, and deleted data in the ARTISTS table to test the triggers. You then viewed the contents of the ARTIST_LOG table to verify that the data modifications had been properly recorded. After that, you dropped the three triggers and the ARTIST_LOG table. By the time you completed the exercise, the INVENTORY database should have been returned to the same state it was in when you began.
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