Hi,
I need to define a Unique index on 3 non-PK fields (composite key) on my
table in PostgreSQL 8.0.3.
The problem is, if any of those 3 fields is Null, PostgreSQL allows
duplicate rows to be inserted. While searching through archives, I found
more information about this.
But I need to know how can I make PostgreSQL throw error on attempt to
insert second record having same 3 field values, one of them being Null.
------------------------------------------------
myid | field1 | field2 | field3 | description
PK | <--- Unique Index ---> |
------------------------------------------------
100 | ABC | XYZ | <null> | Record 1 -> This is ok.
101 | ABC | XYZ | <null> | Record 2 -> * This should error!
------------------------------------------------
Fields {field1, field2, field3} have unique index on them and "myid" is
the primary key of my table.
Oracle 9i throws exception in such case, but PostgreSQL does not.
Thanks,
- Hrishi Joshi.
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