From: | Russell Francis <rfrancis(at)ev(dot)net> |
---|---|
To: | Russell Francis <rfrancis(at)ev(dot)net>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #2503: Query results differ based on record count |
Date: | 2006-06-29 19:03:12 |
Message-ID: | 44A423F0.6030206@ev.net |
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Lists: | pgsql-bugs |
Alvaro Herrera wrote:
> Russell Francis wrote:
>
>> If a SELECT statement contains a table in it's FROM clause which has 0
>> records in it, the query will not return any results. If a record is added
>> to the table even though it shouldn't modify the results of query, the query
>> will return the expected result.
>>
>> The SQL statements below are a trimmed down test case which duplicates this
>> issue. The identical SELECT statements return different results depending
>> on the record count of the unrelated table_b.
>>
>> SELECT table_a.* FROM table_a, table_b WHERE table_a.ta_col_a > 0;
>
> table_b is certainly not unrelated, as it appears in the FROM clause.
> So the query is correct to not show any result, per definition of
> cartesian product.
>
Alvaro,
Yes, you are correct. Sorry.
Thanks,
Russ
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