On Fri, May 14, 2010 at 10:11 AM, Fabio Spadaro <[email protected]> wrote:
> Hi,
>
> 2010/5/14 P Kishor <[email protected]>
>
>> On Fri, May 14, 2010 at 9:49 AM, Fabio Spadaro <[email protected]>
>> wrote:
>> > hi,
>> >
>> > 2010/5/14 P Kishor <[email protected]>
>> >
>> >> On Fri, May 14, 2010 at 9:01 AM, Fabio Spadaro <[email protected]
>> >
>> >> wrote:
>> >> > I need to identify data types extracted from a
>> >> > join between multiple tables without using cross-checking table_info
>> more
>> >> > pragmatic.
>> >> >
>> >>
>> >> Could you clarify what you really want to do? Your question is not
>> >> clear at all, at least to me. What do you mean by "using
>> >> cross-checking table_info more pragmatic"? More pragmatic than what?
>> >>
>> >> > Is there a faster way to do it?
>> >> >
>> >>
>> >> Faster than what?
>> >>
>> >> If you want data_types, you can use SELECT Typeof(column_name)
>> >>
>> >>
>> >>
>> >>
>> >
>> > I use python sqlite embedded and in my application I have a panel where
>> you
>> > can
>> > type a query and see the results in a panel's grid
>> > Now suppose that I type a query like "select
>> > a.field1, b.field2 from table1 a, table2 b " such data
>> > will be displayed in grid but I need to know what types of data I
>> obtained.
>> > How do it?
>>
>>
>> SELECT a.field1, Typeof(a.field1), b.field2, Typeof(b.field2)
>> FROM table1 a, table2 b...
>>
>>
>> >
>
> It does not work, It always return data type text.
>
That is because your table has probably defined those columns as TEXT.
Consider the following --
sqlite> CREATE TABLE t (a TEXT, b INTEGER);
sqlite> INSERT INTO t VALUES ('foo', 5);
sqlite> SELECT a, Typeof(a), b, Typeof(b) FROM t;
a Typeof(a) b Typeof(b)
---------- ---------- ---------- ----------
foo text 5 integer
sqlite>
--
Puneet Kishor http://www.punkish.org
Carbon Model http://carbonmodel.org
Charter Member, Open Source Geospatial Foundation http://www.osgeo.org
Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor
Nelson Institute, UW-Madison http://www.nelson.wisc.edu
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