Calculated Field in Relationship

Hi i'm trying to add a calculated field in a relation table.
but it always fails. I Just want to have the Date in Datum plus 2 years added as Ablaufdatum.
Table Structure
Betriebsmedizin
MedID
Title
TnMed
MedID
TnID
Datum
Mitarbeiter
TnID
Name
Any Ideas why that always fails?
- Code: Select all
__sql__="SELECT * , DATE_ADD( STR_TO_DATE( Datum, '%Y-%m-%d' ) , INTERVAL 2 YEAR ) AS Ablaufdatum
FROM TnMed pc
INNER JOIN Betriebsmedizin c ON pc.MedID = c.MedID
WHERE pc.TnID = '$TnID'"
but it always fails. I Just want to have the Date in Datum plus 2 years added as Ablaufdatum.
Table Structure
Betriebsmedizin
MedID
Title
TnMed
MedID
TnID
Datum
Mitarbeiter
TnID
Name
Any Ideas why that always fails?