To answer this question, we need to understand how to generate an alias for a calculated column in SQL.
Option A) SELECT ename, salary*12 'Annual Salary' FROM employees; - This option is incorrect because it uses single quotes (' ') to define the alias. In SQL, single quotes are used to define string literals, not column aliases.
Option B) SELECT ename, salary*12 "Annual Salary" FROM employees; - This option is correct because it uses double quotes (" ") to define the alias. In SQL, double quotes are used to define column aliases. Therefore, the alias "Annual Salary" is correctly generated for the calculated column salary*12.
Option C) SELECT ename, salary*12 AS Annual Salary FROM employees; - This option is incorrect because it uses the keyword AS without double quotes to define the alias. In SQL, the AS keyword is used to define aliases, but the alias itself should be enclosed in double quotes.
Option D) SELECT ename, salary*12 AS INITCAP("ANNUAL SALARY") FROM employees - This option is incorrect because it uses the INITCAP function within the alias definition. The INITCAP function is used to capitalize the first letter of each word in a string. It is not necessary in this case, as the alias "Annual Salary" does not require any special formatting.
The correct answer is B) B. SELECT ename, salary*12 "Annual Salary" FROM employees. This option correctly generates the alias "Annual Salary" for the calculated column salary*12.