Tag: databases

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

Option A) SELECT ADD_MONTHS(MAX(hire_Date), 6) FROM EMP; This option calculates the maximum hire date from the EMP table and adds 6 months to it using the ADD_MONTHS function. The result is a date value, not a numeric value.

Option B) SELECT ROUND(hire_date) FROM EMP; This option rounds the hire_date column values to the nearest whole number. The result is a date value, not a numeric value.

Option C) SELECT sysdate-hire_date FROM EMP; This option subtracts the hire_date column values from the current date (sysdate) using the minus operator. The result of this subtraction operation is a numeric value representing the number of days between the hire date and the current date.

Option D) SELECT TO_NUMBER(hire_date + 7) FROM EMP; This option adds 7 days to the hire_date column values and then converts the result to a numeric value using the TO_NUMBER function. The result is a numeric value.

The correct answer is option C. This option returns a numeric value because it calculates the number of days between the hire date and the current date.

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• Wrong explanation

To answer this question, you need to understand the concept of object privileges and views.

A view is a virtual table that is based on the result of a query. It allows you to retrieve data from one or more tables as if it were a single table. When granting privileges on a view, you can specify which operations can be performed on the view.

Let's go through each option to understand which object privileges can be granted on a view:

Option A) None - This option is incorrect because object privileges can be granted on a view.

Option B) DELETE, INSERT, SELECT - This option is incorrect because it does not include the UPDATE privilege, which can be granted on a view.

Option C) ALTER, DELETE, INSERT, SELECT - This option is incorrect because it does not include the UPDATE privilege, which can be granted on a view.

Option D) DELETE, INSERT, SELECT, UPDATE - This option is correct because it includes all the object privileges that can be granted on a view. With these privileges, you can perform operations such as deleting, inserting, selecting, and updating data on the view.

The correct answer is option D.

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• Wrong explanation