DEMO FIDDLE
HTML
<table>
<tr>
<td>Row 1 Col 1</td>
<td>Row 1 Col 2</td>
<td>Row 1 Col 3</td>
</tr>
</table>
CSS
table {
width:100%;
}
td {
border:1px solid grey;
}
td:nth-child(2) {
width:1px;
white-space:nowrap;
}