oints to the primary key of 
a row in another table. Foreign keys establish relationships between rows
stored in different tables.
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</dd><dt><font color="black"><b>index:</b></font></dt><dd><font color="black"> Additional data that the database software maintains as rows
are inserted into a table designed to make lookups very fast.
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</dd><dt><font color="black"><b>logical key:</b></font></dt><dd><font color="black"> 