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Michael Paravicini
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Join on Expression gives an error

I have a table Pax (PaxId, PaxName) and a query qryPaxRooms (RoomPaxId, PaxName). RoomPaxId in the query is an expression with Nz(ResRooms.PaxId,ResPaxid) AS RoomPaxId. So if a reservation has no rooms yet assigned RoomPaxId will have the PaxId of the reservation otherwise the PaxId of the Room Owner (might be different). Now if I try to join table qryPaxRooms with a different table Invoices (InvID, InvDate, PaxId) on qryPaxRooms.RoomPaxId with Invoices.PaxId I get a type mismatch error. Is it not possible to do a join on expressions? Is there a different solution? Thank you so much for any help! Regards Michael
Microsoft Access

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Michael Paravicini

8/22/2022 - Mon
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Ryan Chong

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Gustav Brock

As your IDs probably are numeric, try to force a Long for the ID:

CLng(Nz(ResRooms.PaxId,ResPaxid)) AS RoomPaxId

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Or you could attach a database with sample values.
Michael Paravicini

ASKER
Thank you to both of you for your help. Best regards Michael
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck