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To add request parameters to an <apex:commandLink>, use nested <apex:param> components.

A link that executes an action defined by a controller, and then either refreshes the current page,
or navigates to a different page based on the PageReference variable that is returned by the
action. An <apex:commandLink> component must always be a child of an <apex:form>
component.
To add request parameters to an <apex:commandLink>, use nested <apex:param> components.

To override this behavior, use the headerValue attribute on the column, or the column’s header facet.

A single column in a table. An <apex:column> component must always be a child of an
<apex:dataTable> or <apex:pageBlockTable> component.
Note that if you specify an sObject field as the value attribute for an <apex:column>, the
associated label for that field is used as the column header by default. To override this behavior,
use the headerValue attribute on the column, or the column’s header facet.


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