e a 
spreadsheet with multiple sheets. The primary data structures 
in a database are:
<b>tables</b>, <b>rows</b>, and <b>columns</b>. <br />
</font><div align="center"><font color="black"><img src="cfbook016.png" /></font></div><font color="black">
<br />
In technical descriptions of relational databases the concepts of 
table, row, and column are more formally referred
to as <b>relation</b>, <b>tuple</b>, and <b>attribute</b>, respectively.
We will use the less formal terms in this chapter.</font><br />
<