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.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> ------------------------ Yahoo! Groups Sponsor
>>>> --------------------~--> $4.98 domain names from Yahoo!. Register
>>>> anything. http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/67folB/TM
>>>>
>>>
>>
>

--------------------------------------------------------------------~->

>>>>
>>>>
>>>> Yahoo! Groups Links
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>> ------------------------ Yahoo! Groups Sponsor
>>> --------------------~--> $4.98 domain names from Yahoo!. Register
>>> anything. http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/67folB/TM
>>>
>>
>

--------------------------------------------------------------------~->

>>>
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>
>>
>>
>> Yahoo! Groups Sponsor
>>
>> ADVERTISEMENT
>>
>>
>

<http://us.ard.yahoo.com/SIG=129j18rva/M=298184.5639630.6699735.3001176/

> D=gr
>>
>

oups/S=1705115386:HM/EXP=1103395007/A=2495208/R=0/SIG=11egg01lg/*http://

> www.
>> netflix.com/Default?mqso=60188914> click here
>>
>>
>

<http://us.adserver.yahoo.com/l?M=298184.5639630.6699735.3001176/D=group

> s/S=
>>> HM/A=2495208/rand=815381014>
>>
>> _____
>>
>> Yahoo! Groups Links
>>
>>
>> * To visit your group on the web, go to:
>> http://groups.yahoo.com/group/firebird-support/
>>
>>
>> * To unsubscribe from this group, send an email to:
>> firebird-support-unsubscribe@yahoogroups.com
>>
>

<mailto:firebird-support-unsubscribe@yahoogroups.com?subject=Unsubscribe

>>
>>
>>
>> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
>> Service <http://docs.yahoo.com/info/terms/> .
>>
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>> ------------------------ Yahoo! Groups Sponsor
>> --------------------~--> Make a clean sweep of pop-up ads. Yahoo!
>> Companion Toolbar. Now with Pop-Up Blocker. Get it for free!
>> http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/67folB/TM
>>
>

--------------------------------------------------------------------~->

>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>
>
>
> Yahoo! Groups Sponsor
>
> ADVERTISEMENT
>
>

<http://us.ard.yahoo.com/SIG=129p5ej0e/M=298184.5639630.6699735.3001176/
D=gr

>

oups/S=1705115386:HM/EXP=1103396625/A=2495202/R=0/SIG=11evjk50a/*http://
www.

> netflix.com/Default?mqso=60188913> click here
>
>

<http://us.adserver.yahoo.com/l?M=298184.5639630.6699735.3001176/D=group
s/S=

>> HM/A=2495202/rand=469013377>
>
> _____
>
> Yahoo! Groups Links
>
>
> * To visit your group on the web, go to:
> http://groups.yahoo.com/group/firebird-support/
>
>
> * To unsubscribe from this group, send an email to:
> firebird-support-unsubscribe@yahoogroups.com
>

<mailto:firebird-support-unsubscribe@yahoogroups.com?subject=Unsubscribe

>
>
>
> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of

Service

> <http://docs.yahoo.com/info/terms/> .
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------ Yahoo! Groups Sponsor
> --------------------~--> Make a clean sweep of pop-up ads. Yahoo!
> Companion Toolbar. Now with Pop-Up Blocker. Get it for free!
> http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/67folB/TM
>

--------------------------------------------------------------------~->

>
>
> Yahoo! Groups Links
>
>
>