You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which the view was create.) How do you obtain the definition of the view?
Use the DESCRIBE command in the EMP_DEPT VU view.
Use the DEFINE VIEW command on the EMP_DEPT VU view
Use the DESCRIBE VIEW command on the EMP_DEPT VU view
Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view
To view the definition of a database view, you query the USER_VIEWS data dictionary view, which stores the view's SQL query text in the TEXT column. DESCRIBE only lists columns, data types, and nullability, not the defining query, and DEFINE/DESCRIBE VIEW are invalid commands.
To obtain the definition of a view, you can query the data dictionary view called USER_VIEWS. This view contains information about all the views owned by the current user.
Option A) Using the DESCRIBE command in the EMP_DEPT_VU view is incorrect. The DESCRIBE command is used to display the structure of a table, not a view.
Option B) Using the DEFINE VIEW command on the EMP_DEPT_VU view is incorrect. The DEFINE VIEW command is not a valid command in most database systems. It is not used to obtain the definition of a view.
Option C) Using the DESCRIBE VIEW command on the EMP_DEPT_VU view is incorrect. The DESCRIBE VIEW command is not a valid command in most database systems. It is not used to obtain the definition of a view.
Option D) Querying the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view is correct. The USER_VIEWS view contains information about all the views owned by the current user, including their definitions.
Therefore, the correct answer is D) Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.