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<title>Editing a Column Definition</title>
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<h1 class="p_Heading1"><span class="f_Heading1">Editing a Column Definition</span></h1>
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<p class="p_Normal">The Column Handling dialog allows you to set options for each comparison column. A subset of this dialog is used to set default handling for all columns.</p>
<p class="p_Normal">Specify the <span class="f_Command">Name</span> to be displayed in the header of the comparison column. If none is specified, an automatic one may be used.</p>
<p class="p_Normal">Mark the <span class="f_Command">Key</span> checkbox to make data in this column control sorting and alignment. If you have more than one key column, the priority for sorting is granted to the top-most columns in the list.</p>
<p class="p_Normal">Mark the <span class="f_Command">Use Default</span> checkbox to use the default column handling as defined for this session.</p>
<p class="p_Normal">Pick the appropriate <span class="f_Command">Type</span> for the column:</p>
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<td style="vertical-align:top; width:78px; padding:0px;"><p class="p_Command"><span class="f_Command">Detected</span></p>
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<td style="vertical-align:top; padding:0px;"><p class="p_Normal">Automatically determine the column type based on the data in the files.</p>
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<td style="vertical-align:top; width:78px; padding:0px;"><p class="p_Command"><span class="f_Command">Boolean</span></p>
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<td style="vertical-align:top; padding:0px;"><p class="p_Normal">Column values are either "True" or "False", or numeric. Zero is equivalent to False and any non-zero value is True.</p>
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<td style="vertical-align:top; width:78px; padding:0px;"><p class="p_Command"><span class="f_Command">Date</span></p>
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<td style="vertical-align:top; padding:0px;"><p class="p_Normal">Column contains date-time values in any common format. The comparison ignores differences in formatting.</p>
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<td style="vertical-align:top; width:78px; padding:0px;"><p class="p_Command"><span class="f_Command">Numeric</span></p>
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<td style="vertical-align:top; padding:0px;"><p class="p_Normal">Column values are interpreted as real number values. The comparison ignores differences in formatting. For example, 0.00 and 0 are considered the same.</p>
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<td style="vertical-align:top; width:78px; padding:0px;"><p class="p_Command"><span class="f_Command">Text</span></p>
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<td style="vertical-align:top; padding:0px;"><p class="p_Normal">Column contains textual data.</p>
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<p class="p_Normal">Mark the <span class="f_Command">Unimportant</span> checkbox to indicate that this column is not important to the comparison. (Unimportant differences are colored blue instead of red, or are ignored altogether using the <span class="f_Command">Ignore Unimportant Differences</span> <img width="16" height="16" style="margin:0;width:16px;height:16px;border:none" src="insigignored.png"/> feature.)</p>
<p class="p_Normal">Use <span class="f_Command">Date tolerance</span> to allow date-time values in this column to differ by the given amount before being considered an important difference.</p>
<p class="p_Normal">Set the <span class="f_Command">Numeric tolerance</span> value to allow numbers to differ by the given amount before being considered an important difference.</p>
<p class="p_Normal">The <span class="f_Command">Text important, except for</span> options govern columns that are defined or detected as Text. Mark the <span class="f_Command">Character case (ABC = abc)</span> checkbox if differences in case (i.e., capitalization) are unimportant. Mark the <span class="f_Command">Whitespace</span> checkbox to consider differences in whitespace (the number of blanks before, after or between words) unimportant.</p>
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