Thank you, Igor. :)

2013/6/13 Igor Tandetnik <i...@tandetnik.org>

> On 6/13/2013 12:24 AM, Yongil Jang wrote:
>
>> SELECT
>>    name,
>>    (SELECT COUNT(id) FROM foods_episodes WHERE food_id=f.id) count
>> FROM
>>    foods f
>> ORDER BY count DESC LIMIT 10;
>>
>>
>> Result from v3.7.6 and v3.7.11.
>>
>> Hot Dog|5
>> Kasha|4
>> Ketchup|4
>> ......
>>
>>
>> Result from v3.7.13 and v3.7.17.
>>
>> Wax Beans (Generic brand)|412
>>
>>
>> Which result set is correct?
>> When I changed statement from COUNT(id) to COUNT(food_id) or COUNT(*), it
>> shows same result with older version.
>>
>
> Looks like a bug in the newer versions. id resolves to f.id, which within
> the context of the sub-select is a constant. So COUNT(id) should work no
> differently than, say, COUNT(1), which in turn should be equivalent to
> COUNT(*).
>
> Of course, there is really no good reason to write COUNT(id) here.
> --
> Igor Tandetnik
>
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