Storage Box wrote:

> Also, sometimes it's better to query more than once to get
> values+sub-values than it is to make a single monster of a
> joined/union query.

This is the design approach I'm taking (and have taken with other
dbmses), but lack of temp tables and/or subqueries is making it
difficult. Where do you put the intermediate results in Firebird? Is my
only option here a stored procedure?

-- Garrett

> _____
>
> From: Garrett Smith [mailto:garrett@...]
> Sent: Friday, December 17, 2004 12:32 PM
> To: firebird-support@yahoogroups.com
> Subject: RE: [firebird-support] Temporary tables
>
>
> In most cases, yes, we can limit the results before the union. As for
> paging, I think this has to occur after the union, as it will depend
> on sort order.
>
> Is a view with 1000+ columns utter stupidity? Or is it something
> Firebird can handle without a terrible memory/performance hit?
>
> At the end of the day, I suppose I could create a new view, run the
> query, then drop it. This seems painful though.
>
> OTOH, perhaps a store procedure is what I'm looking for. I could loop
> through all the tables involved, performing the appropriate subquery,
> adding to a result set, and then sort the result. The set returned by
> the procedure contains a single ID column.
>
> Storage Box wrote:
>> Is there any way your usage of the query could measure your results,
>> as in "paging" or selecting a range of values by date, getting the
>> top 100 records, etc.
>>
>> Depending on the size of the table(s), a UNION, JOIN, or any other
>> type of relationship can make for a large number of records, killing
>> performance.
>>
>> _____
>>
>> From: Garrett Smith [mailto:garrett@...]
>> Sent: Friday, December 17, 2004 12:13 PM
>> To: firebird-support@yahoogroups.com
>> Subject: RE: [firebird-support] Temporary tables
>>
>>
>> I actually want three columns after the combination (I'm
>> experimenting with unions now):
>>
>> name | foo_name | bar_name
>>
>> where 'name' is your 'foobar.name'. For foo records, foo_name
>> contains a corresponding value, otherwise NULL. Same pattern for
>> bar_name. There are no common IDs between tables.
>>
>> Looks like I could create a view that's a huge union, covering all
>> permutations, and thus avoid a temporary table. But I'm a tad nervous
>> about a) the size of the union SQL and b) the number of columns in
>> the view.
>>
>> -- Garrett
>>
>> Storage Box wrote:
>>> Sounds like you need a UNION - or - are you trying to treat both
>>> name columns as a single column with a single unified name?
>>>
>>> before "temp" table:
>>>
>>> foo.name | bar.name
>>>
>>> after combination:
>>>
>>> foobar.name
>>>
>>> _____
>>>
>>> From: Garrett Smith [mailto:garrett@...]
>>> Sent: Friday, December 17, 2004 11:46 AM
>>> To: firebird-support@yahoogroups.com
>>> Subject: RE: [firebird-support] Temporary tables
>>>
>>>
>>> Ah, sorry, correction...the problem with joins (and I think this is
>>> also a problem with the view solution) is that I want to select
>>> something like:
>>>
>>> select * from ... where name = 'Blah'
>>>
>>> Note there's no table qualifier. I.e. I want the thing I'm querying
>>> to have a name column that is a merging of foo.name and bar.name.
>>> Thus the temporary table.
>>>
>>>
>>>
>>> -- Garrett
>>>
>>> Garrett Smith wrote:
>>>> This could be the best approach -- I was just trying to keep the
>>>> SQL simple. But I'm probably past that point :)
>>>>
>>>> -- Garrett
>>>>
>>>> Adomas Urbanavicius wrote:
>>>>> Why not
>>>>> View or query
>>>>>
>>>>> select * from foo
>>>>> left join bar on
>>>>> foo.id = bar.id
>>>>> where foo.name = 'Baz'
>>>>> or foo.status = 1
>>>>> /*
>>>>> or any other :
>>>>> bar.status = 1
>>>>> bar.name = 'Blah'
>>>>> */
>>>>>
>>>>>
>>>>>
>>>>>>
>>>>>> I have several tables that I want to query as if their rows were
>>>>>> in a single table. My thinking was to use a temporary table and
>>>>>> execute multiple 'select into' queries to populate it and then
>>>>>> run a final select against it.
>>>>>>
>>>>>> E.g., given two tables:
>>>>>>
>>>>>> foo ( id integer, name varchar)
>>>>>> bar ( id integer, name varchar, status integer)
>>>>>>
>>>>>> I want a structure looks like:
>>>>>>
>>>>>> some_structure (
>>>>>> name varchar,
>>>>>> status integer,
>>>>>> foo_name varchar,
>>>>>> bar_name varchar,
>>>>>> bar_status integer)
>>>>>>
>>>>>> so I can run queries like:
>>>>>>
>>>>>> select id from some_structure where name = 'Baz' or status = 1;
>>>>>> select id from some_structure where foo_name = 'Baz' or
>>>>>> bar_status = 1;
>>>>>>
>>>>>> Rows from table foo would NULL values for status. The underlying
>>>>>> applications lets users select objects (represented by id) by
>>>>>> specifying property name values. We validate input to ensure that
>>>>>> an unqualified properties (e.g. 'name', as opposed to
>>>>>> 'bar_name') have compatible types.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
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