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ERROR SETTING FK


ERROR SETTING FK

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lonhanner
lonhanner
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I receive the following error when trying to set FK
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "fk_TRIP_DETAILS_RIDER_NO". The conflict occurred in database "DCTSSQL ", table "dbo.RIDERS", column 'RIDER_NO'.

ALTER TABLE TRIP_DETAILS
ADD CONSTRAINT fk_TRIP_DETAILS_RIDER_NO
FOREIGN KEY (RIDER_NO)
REFERENCES RIDERS(RIDER_NO);
GilaMonster
GilaMonster
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There's a RiderNo in trip details that does not have a matching entry in Riders

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Orlando Colamatteo
Orlando Colamatteo
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You have some orphaned data that you'll need to cleanup before adding the constraint.

SELECT  RIDER_NO
FROM TRIP_DETAILS
WHERE RIDER_NO NOT IN (SELECT RIDER_NO
FROM RIDERS);



Or you can do this incrementally by adding the constraint WITH NOCHECK to in effect prevent the creation of new orphaned rows but tolerate the existing orphans, then cleaning up the bad data as time allows, and finally once all orphans are removed or resolved going back and CHECKing the constraint:

-- 1. add constraint but do not check existing rows
ALTER TABLE TRIP_DETAILS WITH NOCHECK
ADD CONSTRAINT fk_TRIP_DETAILS_RIDER_NO
FOREIGN KEY (RIDER_NO)
REFERENCES RIDERS(RIDER_NO);

-- 2. cleanup orphans as time allows...

-- 3. check the constraint to let the database engine record that it can rely on the existing data conforming to the constraint
ALTER TABLE TRIP_DETAILS CHECK CONSTRAINT fk_TRIP_DETAILS_RIDER_NO;



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lonhanner
lonhanner
Old Hand
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Thanks opc.three I got if fixed thanks to you.

Lon
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