Querying a list field against another list

Hi,

I tried to mail this to the novice list I believe it was rejected:

>>
The original message was received at 2004-11-26 14:55:09 +0100
from postoffice.local [10.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<jens(at)headlong(dot)se>

   -----Transcript of session follows -----
... while talking to postoffice.local.:
>>> RCPT To:<jens(at)headlong(dot)se>
<<< 550 5.1.1 unknown or illegal alias: jens(at)headlong(dot)se
550 <jens(at)headlong(dot)se>... User unknown
>>

So here's my question.

Hi people,

This is not quite a pg question, but any suggestions are most welcome.

How can one query a list of values against a db field that contains a list of
values ?

Table foo

foo_id | foo_name | da_list
--------------------------------------
1 | x | 1,2,3,4,5
2 | y | 1,4,5
3 | z | 4,5,11
4 | xyz | 14,15,33

As a result from another query I have parameter bar = '1,4' and want to find
all rows from foo where da_list contains '1' or '4'. So loop over bar to loop
over da_list in foo ?

My humble thanks,

Aarni

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