Question: Based on the following query: SELECT P_CODE, SUM(LINE_UNITS) FROM LINE GROUP BY P_CODE HAVING SUM(LINE_UNITS) > (SELECT MAX(LINE_UNITS) FROM LINE); Should you create an index?

Based on the following query:

SELECT        P_CODE, SUM(LINE_UNITS)

FROM          LINE

GROUP BY  P_CODE

HAVING       SUM(LINE_UNITS) > (SELECT MAX(LINE_UNITS) FROM LINE);


Should you create an index? If so, what would the index column(s) be, and why would you create that index? If not, explain your reasoning.

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