Oracle Advanced SQL and PL/SQL Developer Certification Questions and Answers (Dumps and Practice Questions)

Question : Select the statement about the ORDER BY clause which is not correct.

1. When using the ORDER BY clause, it always appears as the last clause in a SELECT statement.
2. The ORDER BY clause may appear in a SELECT statement that does not contain a WHERE clause.
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4. Positional sorting is accomplished by specifying the numeric position of a column as it appears in the SELECT list, in the ORDER BY clause.




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Question : If a table is created without specifying a schema, in which schema will it be?

1. It will be an orphaned table, without a schema.
2. The creation will fail.
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4. It will be in the PUBLIC schema.

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Explanation:






Question : How can you delete the values from one column of every row in a table? (Choose the best answer.)

1. Use the DELETE COLUMN command.
2. Use the TRUNCATE COLUMN command.
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4. Use the DROP COLUMN command.


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Related Questions

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Question : Which join is performed by the following query? (Choose the best answer.)
SELECT E.USER_ID, J.CLICK_ID FROM TABLE1 E and TABLE2 J ON (E.CLICKS < J.MAX_CLICKS);

1. Equijoin
2. Nonequijoin
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4. Outer join





Question : Which of the following statements are syntactically correct?

1. SELECT * FROM EMPLOYEES E JOIN DEPARTMENTS D USING (DEPARTMENT_ID);
2. SELECT * FROM EMPLOYEES JOIN DEPARTMENTS D USING (D.DEPARTMENT_ID);
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4. None of the above





Question : The EMPLOYEES and DEPARTMENTS tables have two identically named columns: DEPARTMENT_ID and MANAGER_ID.
Which of these statements joins these tables based only on common DEPARTMENT_ID values?

1. SELECT * FROM EMPLOYEES NATURAL JOIN DEPARTMENTS;
2. SELECT * FROM EMPLOYEES E NATURAL JOIN DEPARTMENTS D ON E.DEPARTMENT_ID=D.DEPARTMENT_ID;
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4. None of the above





Question : Which of the following statements are syntactically correct?


1. SELECT E.EMPLOYEE_ID, J.JOB_ID PREVIOUS_JOB, E.JOB_ID CURRENT_JOB FROM JOB_HISTORY J CROSS JOIN EMPLOYEES E ON (J.START_DATE=E.HIRE_DATE);
2. SELECT E.EMPLOYEE_ID, J.JOB_ID PREVIOUS_JOB, E.JOB_ID CURRENT_JOB FROM JOB_HISTORY J JOIN EMPLOYEES E ON (J.START_DATE=E.HIRE_DATE);
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4. None of the above





Question : If the REGIONS table, which contains rows, is cross joined to the COUNTRIES table, which contains rows,
how many rows appear in the final results set? (Choose the best answer.)

1. 100
2. 4
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4. None of the above





Question :Which three SQL statements would display the value . as $, .?

1. A,B,C
2. B,C,D
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4. D,E,F
5. A,D,E