AND/OR + some nulls in filter

I'm running into another problem with the AND/OR filter.
The filter for selecting from object "a" and joining to objects b, c & d
(b.theid==2 || c.theid==2 || d.theid==3) && active=="Y"
The SQL that gets generated is:
SELECT <...>
FROM b t1, d t3, a t0, c t2
WHERE ((((t1.theid = 2 AND = OR (t2.theid = 2 AND t0.cid
= OR (t3.theid = 3 AND t0.did = AND = 'Y')
This returns a number of instances of the same a object when some of the
OR clauses do not match. For example, if there's no record
with d.theid=3, then it will do a full join on table d.
Do I need to specify something else to flag these as potentially null
fields so that the filter parser adds that check in? The following SQL
query works
ok if I add some checks for NULL on those join fields:
SELECT <...>
FROM b t1, d t3, a t0, c t2
WHERE ((((t1.theid = 2 AND = OR IS NULL) OR
(t2.theid = 2 AND t0.cid = OR t0.cid IS NULL)) OR (t3.theid = 3
AND t0.did = OR t0.did IS NULL)) AND = 'Y')
Mike Bridge

Hi D,
Thank you for your answer.
I have seriously thought about that solution; but I don't think it's a smart way to do it.
If i do it like that, i need to copy the whole table and paste it inside the if statements.
I have two xml elements that I need to make the decisions on. POH_PO_TYPE & CP_RELEASE_NUM.
CP_RELEASE_NUM can be: '' or N
THEN show table (which contains the whole PO).
It shall show the content of the PO in any of these cases.
BR Kenneth

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    Another approach you might consider is reinstalling Logic Pro X. To do this effectively, you need to remove the application, then reinstall Logic Pro X. You don't have to remove everything that was installed with Logic Pro X. Follow the steps below to completely reinstall a fresh copy of Logic Pro X.
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    Thank you for using Apple Support Communities.

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