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Cannot get query criteria to work

Fritz Paul
Fritz Paul asked
Last Modified: 2015-03-02
Access 2010.

I have a form [Enquiries], with a combo box [cboSelectQualification]. The combo box selects a number which I want to use to limit the results of a query.
If there is no number selected i.e. the box is clean, then I want the query to return all values, but when a number is selected, the query must return only results corresponding to that number.
The criteria below works for the case where a number is selected, but results in no records shown if a value is not selected.

IIf(Len([Forms]![Enquiries]![cboSelectQualification])>0,[Forms]![Enquiries]![cboSelectQualification],Like "*" )

This below does also not return anything if nothing is selected.

IIf(Len([Forms]![Enquiries]![cboSelectQualification])>0,[Forms]![Enquiries]![cboSelectQualification],Like "*" & [Forms]![Enquiries]![cboSelectQualification])

Can you spot the problem please
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