On Jan 13, 2010, at 2:14 PM, Andrus Adamchik wrote:
>
> On Jan 13, 2010, at 2:02 PM, Andrus Adamchik wrote:
>
>>
>> paintings.exhibits.start > $date1 AND paintings.exhibits.name like
>> 'X%'
>> OR
>> paintings.exhibits.start < $date2 AND paintings.exhibits.name like
>> 'Y%'
>> OR
>> paintings.exhibits.start = $date3 AND paintings.exhibits.name like
>> 'Z%'
>>
>> here you can't describe the desired behavior with "|", but can with
>> aliases:
>>
>> a.start > $date1 AND a.name like 'X%'
>> OR
>> b.start < $date2 AND b.name like 'Y%'
>> OR
>> c.start = $date3 AND c.name like 'Z%'
>
> Wonder if that's a bad example though, as the intended result can be
> obtained without splits... Need to think of a better one. Although
> the idea is that there can be cases when exact control over joins is
> needed.
>
> Andrus
How about this (looking for artists that have multiple paintings with
multiple exhibits, each matching its own set of criteria) :
a.start > $date1 AND a.name like 'X%'
AND
b.start < $date2 AND b.name like 'Y%'
AND
c.start = $date3 AND c.name like 'Z%'
Andrus
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