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Thanks gary works a treat.
jason
OK - here are the tricks with UNIONS.....
* Firstly - the "types" of the data for
each column MUST be the same (best option is a string) - you can use CAST (at
least in SQL Server) to ensure the data are the right types.
* Secondly - you have to have the same number of
columns in each query - SO.... make up dummy data for those tables that dont
have the same columns
* Thirdly - you
can only have one ORDER BY clause
*
Fourthly - it is always useful to add an additional column that has some
indicator of which sub-query the data came from - a number or a string - this
means you can then adjust your code to the "type" of data record you are
getting back.
For example:
Table 1 - has 3 integer fields
Table 2 - has 2 integer fields and 3
strings
Table 3 - has 2 real values
and a bit field
The UNION goes a
little like this (NOTE - this is NOT really valid SQL but it's close):
SELECT
'Table1' as recordType,
CAST(int1 as real) as
real1,
CAST(int2 as real) as real2,
CAST(int2 as integer) as int1,
'' as string1,
'' as
string2,
'' as string3,
0 as bit1
FROM
table1
UNION
SELECT
'Table2' as recordType,
CAST(int1 as real) as real1,
CAST(int2 as real) as
real2,
0
as int1,
string1,
string2,
string3,
0
as bit1
FROM
table2
UNION
SELECT
'Table3' as recordType,
CAST(real1 as real) as real1,
CAST(real2 as real) as
real2,
0
as int1,
'' as string1,
'' as string2,
'' as string3,
bit1
FROM
table3
ORDER BY
recordType
NOW..... that is only just ONE way to do it. You
could put NULL's into all the fields that are "missing" from the respective
tables. You could duplicate ALL missing fields across each of the
sub-queries. The possibilities are probably
NUMBER_OF_FIELD^NUMBER_OF_TABLES.
But I have never found something that couldn't be coded up as as UNION
if you tried hard enough.
HOWEVER.....
If you want,
you could do the three separate queries and then manually copy the results
into a QUERY that you create yourself in CF and then return that.
Gary Menzel
IT Operations Brisbane
-+- ABN AMRO Morgans Limited
Level 29, 123 Eagle Street BRISBANE QLD
4000
PH: 07 333 44 828 FX: 07 3834 0828
[EMAIL PROTECTED] wrote on 03/21/2003
12:26:25 PM:
> Hi Guys
>
> Anyone know of any easy way
to query 3 different tables, but outputting the
> results of a search as
one single record set ?
> I have tried unions, running 3 seperate select
statements inside the one
> <cfquery>, the tables are quite
different in structure so the union doesnt
> want to play.. There
is no relational aspects between the tables so a join
> wont work
either.
>
> Is there a way to run 3 seperate queries and then
combine the results into a
> single collection for output? I want to do
the next/previous across the
> search results page also hence the
complexity..
>
> Any ideas or thoughts appreciated..
>
> Jason
>
>
>
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