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    <blockquote> <p>What is the best Index to improve the performance for my query?</p> </blockquote> <p>a <strong>clustered primary key</strong></p> <p><a href="http://dev.mysql.com/doc/refman/5.0/en/innodb-index-types.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.0/en/innodb-index-types.html</a></p> <p><a href="http://www.xaprb.com/blog/2006/07/04/how-to-exploit-mysql-index-optimizations/" rel="nofollow noreferrer">http://www.xaprb.com/blog/2006/07/04/how-to-exploit-mysql-index-optimizations/</a></p> <p><a href="https://stackoverflow.com/questions/4419499/mysql-nosql-help-me-to-choose-the-right-one-on-a/4421601#4421601">MySQL and NoSQL: Help me to choose the right one</a></p> <p><a href="https://stackoverflow.com/questions/5451190/60-million-entries-select-entries-from-a-certain-month-how-to-optimize-databas/5451389#5451389">60 million entries, select entries from a certain month. How to optimize database?</a></p> <p><a href="https://stackoverflow.com/questions/5472241/how-to-avoid-using-temporary-in-many-to-many-queries/5473513#5473513">How to avoid &quot;Using temporary&quot; in many-to-many queries?</a></p> <p>however your current clustered PK <strong>sid</strong> wont be much help so try something along the lines of:</p> <pre><code>create table forwarding ( f_date date not null, f_shop int unsigned not null, sid int unsigned not null, -- added for uniqueness ... primary key (f_date, f_shop, sid) -- clustered primary key ) engine=innodb; </code></pre> <p>hope this helps :)</p>
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    1. COhello, the count of data doesn't allow me to add a new primary key.
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    2. COi can't drop the existing primary key because it's an auto increment.
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    3. COi'm sure you can figure out the best composite key combination yourself given the links above ?? do you really need the auto_inc part ?
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