Hello,
Also, have a look at the SUMIF function.
Here's an example:
Sheet1
<TABLE style="BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 2pt; PADDING-RIGHT: 2pt; FONT-FAMILY: Arial,Arial; FONT-SIZE: 10pt" border=1 cellSpacing=0 cellPadding=0><COLGROUP><COL style="WIDTH: 30px; FONT-WEIGHT: bold"><COL style="WIDTH: 83px"><COL style="WIDTH: 64px"><COL style="WIDTH: 19px"><COL style="WIDTH: 83px"><COL style="WIDTH: 97px"></COLGROUP><TBODY><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt; FONT-WEIGHT: bold"><TD></TD><TD>A</TD><TD>B</TD><TD>C</TD><TD>D</TD><TD>E</TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">1</TD><TD style="FONT-FAMILY: Verdana; FONT-WEIGHT: bold">Dates</TD><TD style="FONT-WEIGHT: bold">Sales</TD><TD></TD><TD style="FONT-WEIGHT: bold">Dates</TD><TD style="FONT-WEIGHT: bold">Sales Per Day</TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">2</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">01/07/2010</TD><TD style="TEXT-ALIGN: right">8</TD><TD></TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">01/07/2010</TD><TD style="TEXT-ALIGN: right">23</TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">3</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">01/07/2010</TD><TD style="TEXT-ALIGN: right">10</TD><TD></TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">02/07/2010</TD><TD style="TEXT-ALIGN: right">35</TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">4</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">01/07/2010</TD><TD style="TEXT-ALIGN: right">5</TD><TD></TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">03/07/2010</TD><TD style="TEXT-ALIGN: right">13</TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">5</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">02/07/2010</TD><TD style="TEXT-ALIGN: right">12</TD><TD></TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">04/07/2010</TD><TD style="TEXT-ALIGN: right">5</TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">6</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">02/07/2010</TD><TD style="TEXT-ALIGN: right">15</TD><TD></TD><TD></TD><TD></TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">7</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">02/07/2010</TD><TD style="TEXT-ALIGN: right">8</TD><TD></TD><TD></TD><TD></TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">8</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">03/07/2010</TD><TD style="TEXT-ALIGN: right">6</TD><TD></TD><TD></TD><TD></TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">9</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">03/07/2010</TD><TD style="TEXT-ALIGN: right">7</TD><TD></TD><TD></TD><TD></TD></TR><TR style="HEIGHT: 17px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">10</TD><TD style="TEXT-ALIGN: right; FONT-FAMILY: Verdana">04/07/2010</TD><TD style="TEXT-ALIGN: right">5</TD><TD></TD><TD></TD><TD></TD></TR></TBODY></TABLE>
<TABLE style="BORDER-BOTTOM-STYLE: groove; BORDER-BOTTOM-COLOR: #00ff00; BORDER-RIGHT-STYLE: groove; BACKGROUND-COLOR: #fffcf9; BORDER-TOP-COLOR: #00ff00; FONT-FAMILY: Arial; BORDER-TOP-STYLE: groove; COLOR: #000000; BORDER-RIGHT-COLOR: #00ff00; FONT-SIZE: 10pt; BORDER-LEFT-STYLE: groove; BORDER-LEFT-COLOR: #00ff00"><TBODY><TR><TD>Spreadsheet Formulas</TD></TR><TR><TD><TABLE style="FONT-FAMILY: Arial; FONT-SIZE: 9pt" border=1 cellSpacing=0 cellPadding=2><TBODY><TR style="BACKGROUND-COLOR: #cacaca; FONT-SIZE: 10pt"><TD>Cell</TD><TD>Formula</TD></TR><TR><TD>E2</TD><TD>=SUMIF(A$2:A$10,D2,B$2:B$10)</TD></TR><TR><TD>E3</TD><TD>=SUMIF(A$2:A$10,D3,B$2:B$10)</TD></TR><TR><TD>E4</TD><TD>=SUMIF(A$2:A$10,D4,B$2:B$10)</TD></TR><TR><TD>E5</TD><TD>=SUMIF(A$2:A$10,D5,B$2:B$10)</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
Matty