Given a function CALCTAX : CREATE OR REPLACE FUNCTION calc tax (sal NUMBER) RETURN NUMBER IS BEGIN RETURN (sal * 0.05); END; If you want to run the above function from the SQL *Plus prompt, which statement is true?

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  1. You need to execute the command CALCTAX(1000); .

  2. You need to execute the command EXECUTE FUNCTION calc tax; .

  3. You need to create a SQL *Plus environment variable X and issue the command :X := CALCTAX(1000); .

  4. You need to create a SQL *Plus environment variable X and issue the command EXECUTE :X := CALCTAX;

  5. You need to create a SQL *Plus environment variable X and issue the command EXECUTE :X := CALCTAX(1000);

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Correct Option: E
Explanation:

To run the given function from the SQL*Plus prompt, the user needs to know the correct syntax for invoking a function in Oracle SQL. The function CALCTAX takes in a single parameter, sal, and returns the result of sal * 0.05.

Option A is incorrect because it is missing the keyword SELECT to return the result of the function.

Option B is incorrect because the keyword FUNCTION is not used in the EXECUTE statement, and the argument sal is not provided.

Option C is incorrect because SQL*Plus environment variables are not required to execute a function, and it is missing the keyword SELECT to return the result of the function.

Option D is incorrect because it is missing the argument sal.

Option E is the correct answer because it first declares an SQL*Plus environment variable X, executes the function CALCTAX with the argument 1000, and assigns the result to the variable X. The keyword SELECT is not required because the result is assigned to a variable.

Therefore, the answer is: E. You need to create a SQL*Plus environment variable X and issue the command EXECUTE :X := CALCTAX(1000);

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