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#1
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Referential Integrity Q
Is it Possible to change a common relationship between two tables to Force
Referential Integrity after the data has been entered. I have two tables joined lie this, Models Table; ModelID (PK), PartsID (LI) Indexed-Yes (No Duplicates) Parts Table; PID (PK), PartsID (LI) Indexed-Yes (Duplicates OK) They are linked by PartsID and the primary table is Models Table. There are no duplicates in PartsID in Models Table, but when I try to Enforce Ref. Int I get the mesaage "No index found for the referenced field of the primary table." Any light shed would be very helpful. Thanks, Wally |
#2
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Referential Integrity Q
On Tue, 4 May 2010 12:11:01 -0700, wallymeister
wrote: Is it Possible to change a common relationship between two tables to Force Referential Integrity after the data has been entered. Sure, just so long as there are no existing records which would cause a problem. I have two tables joined lie this, Models Table; ModelID (PK), PartsID (LI) Indexed-Yes (No Duplicates) Parts Table; PID (PK), PartsID (LI) Indexed-Yes (Duplicates OK) They are linked by PartsID and the primary table is Models Table. There are no duplicates in PartsID in Models Table, but when I try to Enforce Ref. Int I get the mesaage "No index found for the referenced field of the primary table." It sounds like you're trying to build the link backward. You have PartsID uniquely indexed in the Models table, rather than in the Parts table. For that matter, why does the Parts table have both a PID (primary key) and also a PartsID? Might a given PartsID value appear repeatedly in Parts, with different PID? If not, why two fields? -- John W. Vinson [MVP] |
#3
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Referential Integrity Q
You got to change to this --
Parts Table; PartsID (PK) -- Build a little, test a little. "wallymeister" wrote: Is it Possible to change a common relationship between two tables to Force Referential Integrity after the data has been entered. I have two tables joined lie this, Models Table; ModelID (PK), PartsID (LI) Indexed-Yes (No Duplicates) Parts Table; PID (PK), PartsID (LI) Indexed-Yes (Duplicates OK) They are linked by PartsID and the primary table is Models Table. There are no duplicates in PartsID in Models Table, but when I try to Enforce Ref. Int I get the mesaage "No index found for the referenced field of the primary table." Any light shed would be very helpful. Thanks, Wally |
#4
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Referential Integrity Q
Thanks Karl & John,
I got it now, as far as the extra PID, I just added that while playing around with a copy of the real thing. It will not be there in the finished product. Anyway thanks again for stilling my fried brain a little to get me thinking correctly. Wally "John W. Vinson" wrote: On Tue, 4 May 2010 12:11:01 -0700, wallymeister wrote: Is it Possible to change a common relationship between two tables to Force Referential Integrity after the data has been entered. Sure, just so long as there are no existing records which would cause a problem. I have two tables joined lie this, Models Table; ModelID (PK), PartsID (LI) Indexed-Yes (No Duplicates) Parts Table; PID (PK), PartsID (LI) Indexed-Yes (Duplicates OK) They are linked by PartsID and the primary table is Models Table. There are no duplicates in PartsID in Models Table, but when I try to Enforce Ref. Int I get the mesaage "No index found for the referenced field of the primary table." It sounds like you're trying to build the link backward. You have PartsID uniquely indexed in the Models table, rather than in the Parts table. For that matter, why does the Parts table have both a PID (primary key) and also a PartsID? Might a given PartsID value appear repeatedly in Parts, with different PID? If not, why two fields? -- John W. Vinson [MVP] . |
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