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READ Free Dumps For Oracle- 1z0-020





Question ID 7778

Examine this statement:

SELECT deptno, job, SUM(sal)

FROM emp

Which GROUP BY clause would you use to generate a subtotal of the sum of salaries in each department, and

a subtotal of the sum of salaries of all the different job types?

Option A

GROUP BY deptno, job;

Option B

GROUP BY CUBE (deptno, job);

Option C

GROUP BY ROLLUP (deptno, job);

Option D

GROUP BY SUM (deptno), SUM (job);

Option E

GROUP BY CUBE (deptno, job, sal);

Correct Answer C
Explanation


Question ID 7779

Why would you drop a column instead of marking it unused?

Option A

You want to release the space.

Option B

You want it to process more quickly.

Option C

You want users to be able to modify the table during the operation.

Option D

You want to prevent users from creating a new column with the same name.

Option E

You want the column data to be available again on export or import of the table.

Correct Answer A
Explanation

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