Re: Strange bug

am 29.11.2005, um 15:31:30 +0100 mailte Leif B. Kristensen folgendes:
> CREATE TABLE citations (
> citation_id INTEGER PRIMARY KEY,
> source_fk INTEGER REFERENCES sources (source_id)
> );
>
> CREATE TABLE relation_citations (
> relation_fk INTEGER REFERENCES relations (relation_id)
> ) INHERITS (citations);

You are using inheritation in PostgreSQL.

>
> ALTER TABLE relation_citations
> ADD CONSTRAINT source_relation_citation UNIQUE
> (source_fk, relation_fk);
> CREATE INDEX cit_relation_key ON relation_citations (relation_fk);
>
> And here is the accident:
>
> pgslekt=> insert into relation_citations values (64062,4578,20017);
> INSERT 1478990 1
> pgslekt=> insert into relation_citations values (64062,4578,20018);
> INSERT 1478991 1

Right, the uniq contraints are on (source_fk, relation_fk).
No problem.

>
> I got an error when I transferred the data to my Web database running
> MySQL:

MySQL is a other RDBMS. You can't expect that all features from
PostgreSQL are working with MySQL.

>
> ERROR 1062 at line 19839 in file: 'ss_relation_citations.sql': Duplicate
> entry '64062' for key 1

My guess: MySQL can't handle inheritance.

HTH, Andreas
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Andreas Kretschmer (Kontakt: siehe Header)
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