I have a table that I am using to hold keys for M:M relationships. I have six fields that can hold the keys and I do this because I validate the key with a foreign key constraint. Fields evevid1, evevid2 hold keys from the event table, evreid1, evreid2 hold keys from the resource table, etc. The 0 works with the FK constraints because in each table being referenced I have a record with id = 0 that is empty. Each row should only have two foreign key values and the other key field values are 0.
How do I put a constraint on the Insert / Update to make sure that only two fields out of the six have a value > 0 in them.
I want to make sure that one of these three fields has a value > 0 and the other two are 0. evevid1 int4 evenid1 int4 evreid1 int4
Same here. I want to make sure that one of these three fields has a value > 0 and the other two are 0. evevid2 int4 evenid2 int4 evreid2 int4
Please reply to me as well as the list because I get the digest version and it might take a while to get the reply there.
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