Auto populate Primary key based on user selection in 3 dependent combo boxes

[ANKUR_JAIN]

I have a table with 4 fields viz Employee ID (Primary key), FirstName, Surname and Date of Birth. The combination of Firstname, Surname and DOB is UNIQUE.

My objective is to find out the Employee ID. I have designed a form which has 3 DEPENDENT combo boxes for Firstname, Surname and DOB respectively. 

I expect that after updating the 3 combo boxes a textbox should autofill to reflect the Employee ID. How should I approach this.

Depicting the above situation in attached excel file for easy understanding.

[#2]

@ANKUR_JAIN 

Hereby a possible solution. I assume you have some basic SQL and VBA knowledge. 

First, set the row sources for the combo boxes with a SQL statement like:

Then, define an After Update event for the DOB combo box (that looks up/sets the Employee ID):

Finally, enter this VBA code into the AfterUpdate event:

Private Sub cmbDOB_AfterUpdate()
  'Lookup the Employee ID
  Me.txtEmployee.Value = DLookup("EmployeeID", "Employee", "Firstname='" & Me.cmbFirst & _
                         "' AND Surname='" & Me.cmbSur & _
                         "' AND DOB=#" & Format(Me.cmbDOB, "yyyy-mm-dd") & "#")
End Sub

When you open the form in view mode, after selecting the combo boxes, the Employee ID is determined:

Hope this helps you in the right direction.

Best wishes,

Tieme