1z0-071 Exam Dumps | Which three statements are true about the DESCRIBE command?

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Question 30/139

Which three statements are true about the DESCRIBE command?

A. It can be used from SQL Developer.

B. It can be used to display the structure of an existing view.

C. It can be used only from SQL*Plus.

D. It displays the NOT NULL constraint for any columns that have that constraint.

E. It displays all constraints that are defined for each column.

F. It displays the PRIMARY KEY constraint for any column or columns that have that constraint.

Correct Answer: A,B,D

A: True. The DESCRIBE command can indeed be used from SQL Developer as well as other Oracle database tools such as SQL*Plus. This command is used to display the structure of a table, view, or other object, showing information such as column names, data types, and whether a column is nullable.
B: True. The DESCRIBE command can be used to display the structure of an existing view, showing similar information as it would for a table. This includes the columns, their data types, and other pertinent details.
D: True. When DESCRIBE is used, it does display the NOT NULL constraints for columns that have this constraint. This is part of the basic information about the structure of a table or view that can help developers understand the requirements of the data stored therein.

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