Problems are 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 on P_CODE? If so, write the SQL command to create the index. If not, explain your reasoning.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Problems are 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 on P_CODE? If so, write the SQL command to create the index. If not, explain your reasoning.

 

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