WHERE using results from another querie

Question

Hi,
Example:
<cfquery name="QUERY 1" datasource="MyDatabase">
SELECT Table1ID, A, B, C
FROM Table1
WHERE A = #Form.A#
<cfoutput query="QUERY1">#A#<br></cfoutput>
It returns:
3
4
<cfquery name="QUERY 2" datasource="MyDatabase">
SELECT Table2ID, A, Z, Y
FROM Table2
WHERE A IN (3,4)
<cfoutput query="QUERY
2">#Table2ID#</br></cfoutput>
It returns:
a
b
c
d
e
f
But if I make QUERY2 as:
<cfquery name="QUERY 2" datasource="MyDatabase">
SELECT Table2ID, A, Z, Y
FROM Table2
WHERE A IN (#QUERY1.A#)
it returns only:
a
b
c
The values a,b,c are the Table2ID's where A=3
The values d,e,f are the Table2ID'a where A=4
How can I make return all values?
Hope you understand.
Thanks
Manel

Answer 1

Think about what you are doing for a second. You are
selecting multiple rows of data with your first query. Then you are
using a cfloop to loop through each row returned from that first
query to perform another query that uses the value returned in the
A column. The problem is that you are executing your second query
once for each row returned by your first query, and you really
aren't saving that result anywhere, since each iteration of the
loop causes your cfselect to overwrite your previous results. You
can create a list variable and populate it with the results from
your first query, but I have to ask, unless you need the results
from your first query for something else, why don't you just join
the two tables and use on equery?
Based on what you have, something like this?
<cfquery name="QUERY 2" datasource="MyDatabase">
SELECT T2.ID, T2.A, T2.Z, T2.Y
FROM Table2 T2
INNER JOIN Table1 T1 ON T2.A = T1.A
WHERE T1.A = #Form.A#
</cfquery>
Phil