External functions can appear in which of the following SQL constructs?

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Multiple Choice

External functions can appear in which of the following SQL constructs?

Explanation:
External functions behave like scalar expressions, so they can be used anywhere an expression is allowed in SQL. That means you can place them in the SELECT list, in WHERE to filter rows, in GROUP BY and HAVING to aggregate and filter groups, in ORDER BY to sort by their result, and even in JOIN ON conditions. They can also appear in subqueries and within VIEW definitions, just like built-in functions. For example, you could SELECT ext_func(col) FROM table; filter with WHERE ext_func(col) > 0; group by ext_func(col); or define a view that uses ext_func in its SELECT. This versatility is why they can appear in any clause of a SQL statement.

External functions behave like scalar expressions, so they can be used anywhere an expression is allowed in SQL. That means you can place them in the SELECT list, in WHERE to filter rows, in GROUP BY and HAVING to aggregate and filter groups, in ORDER BY to sort by their result, and even in JOIN ON conditions. They can also appear in subqueries and within VIEW definitions, just like built-in functions. For example, you could SELECT ext_func(col) FROM table; filter with WHERE ext_func(col) > 0; group by ext_func(col); or define a view that uses ext_func in its SELECT. This versatility is why they can appear in any clause of a SQL statement.

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