To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) The SQL statement displays the desired results. This option is incorrect because the SQL statement will not display the desired results.

Option B) The column in the WHERE clause should be changed to display the desired results. This option is incorrect because the column in the WHERE clause is correct. The column 'DEPARTMENT_ID' is being checked for NULL values, which is the correct approach.

Option C) The operator in the WHERE clause should be changed to display the desired results. This option is correct because the operator used in the WHERE clause is incorrect. To check for NULL values, you should use the 'IS NULL' operator instead of the '=' operator. So the correct SQL statement should be: SELECT LAST_NAME, SALARY, DEPARTMENT_ID FROM EMP WHERE DEPARTMENT_ID IS NULL;

Option D) The WHERE clause should be changed to use an outer join to display the desired results. This option is incorrect because using an outer join is not necessary to display the desired results. The problem lies in the operator used in the WHERE clause, not the join type.

The correct answer is Option C. The operator in the WHERE clause should be changed to use 'IS NULL' instead of '=' to display the desired results.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) The DESCRIBE DEPT statement displays the structure of the DEPT table. This option is correct. The DESCRIBE statement in SQL is used to display the structure of a table. In this case, the DESCRIBE DEPT statement will display the structure of the DEPT table.

Option B) The ROLLBACK statement frees the storage space occupied by the DEPT table. This option is incorrect. The ROLLBACK statement in SQL is used to undo the changes made in the current transaction. It does not directly free the storage space occupied by a table.

Option C) The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist. This option is incorrect. Since the CREATE TABLE dept statement is executed before the DESCRIBE DEPT statement, the DEPT table does exist. Therefore, the DESCRIBE DEPT statement will not return an error.

Option D) The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement. This option is incorrect. The DESCRIBE statement can be used to display the structure of a table regardless of whether a COMMIT statement has been executed or not.

The correct answer is A. The DESCRIBE DEPT statement displays the structure of the DEPT table.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) Job View - This option is correct. In the Datastage Director, the Job View is used to view and manage the jobs. It provides information about the job status, such as whether the job is running, completed, or failed. It also allows you to monitor the progress of the job and view detailed job logs.

Option B) Run View - This option is incorrect. There is no specific "Run View" in Datastage Director. It might be a misinterpretation or a term used in a different context.

Option C) Log View - This option is correct. The Log View in Datastage Director allows you to view the detailed log information for a job. It displays the log messages generated during the job run, including any error messages or warnings. This view is useful for troubleshooting and debugging purposes.

Option D) Status View - This option is correct. The Status View in Datastage Director provides an overview of the job status. It shows the current status of the job, such as running, completed, or failed. It also displays information about the job run, such as the start time, end time, and duration.

Therefore, the correct answer is A, C, D. These options represent the Job View, Log View, and Status View in Datastage Director.

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• Wrong explanation