Should be easy... checking for an existing record

Hi all, I need help on something that seems like it should be easy to
do.

When entering new data onto any form in my database the field [SubNo]
has to exist in another table (tblPatients). If a SubNo is entered
that isn't already on tblPatients, I want it to open the form
frmNewPatient to add the patient to tblPatients; If the SubNo is
already in tblPatients, I want it to do nothing. I can't figure out
what the condition should be in a macro to make this happen. Any
suggestions?

Thanks!!

Cheryl

Put the following code in AfterUpdate event of [SubNo]:

If DCount("[SubNo]","TblPatients","[SubNo] = " &
Forms!NameOfYourForm![SubNo]) = 0 Then
DoCmd.OpenForm "FrmNewPatient"
End If

The above assumes [SubNo] is numeric. If it is text, change the first line
to:
If DCount("[SubNo]","TblPatients","[SubNo] = '" &
Forms!NameOfYourForm![SubNo] & "'") = 0 Then

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<Cheryl.D.Monroe@gmail.comwrote in message
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